人教版八年级英语上册全套教案UNIT1-UNIT12 教案正文随堂记录Unit 1 How often do you exercise ?Teaching goals:1.Words &phrases: how often , hardly , twice , once ,difference , look after , although ,etc .2.Learn to talk about how often do you do things .3.一些表示频率的副词: always , usually , often , never ,hardly ever , sometimes .4.句子结构: What do you usually do on weekends ?How often ··· ?及回答.Important and difficult points :What does she /he do on weekends ?She often goes to the movies .How often do you shop ?Once a week / Twice a week ··· .Teaching aids : cards , pictures and a tape recorder .Period 1Teaching procedures :Step 1 Leading-in1.Greetings:Talk about something the students did onsummer vacation .Step 2 Pre-taskSB Page 1 , 1a .1.Look at the picture (学生识图). each activity .T: What are they doing ?They are shopping /reading /exercising /watching TV /skateboarding .(Help the students to answer )3.Write the activities on the line .4.Check the answers on the Bb .Correct their ownactivities .5.Practise reading .SB Page 1 , 1c .1.Focus on the conversation in the box .2.Practise reading .3.Pairwork : What do you do on weedends ? I ··· .4.Groupwork :Divide the class into groups of four orfive .Make conversations .First S1 to S2:S1:What do you do on weekends ?S2:I ··· .S1:What does she /he do on weekends ?S2:She /He ··· .5. Act out their own dialogues .Step 3 While-taskSB Page 1 , 1b .1.Look at each picture in 1c.Tell what the person does onweekends .Check the Ss orally.2.Make sure what they will hear and do .3.Read these adverbs and explain.4.Play the tape twice .Write the letters on the line.SB Page 2 , 2a & 2b .1.read the activities and the answers of “how often” first .2.Practise reading .3.In 2a we should know the activities you hear .In 2b weshould know the answers of how often he does the activities.4.Play the tape for a first time .Ss only listen .5.Play the tape a second time .Ss do 2a .6.Play the tape a third time .Check the answers .7.Play the tape .Ss do 2b .8.Check the answers .In this part ,we should pay attention to how often引起的特殊疑问句及回答.Step 4 Post-taskSB Page 2 , 2c .1.Focus on the conversation .2.Practice reading .3.Read the activities in the left box .4.Fill in the chart .5.Pairwork: Make conversations .Period 2Teaching procedures :Step 1 Leading-in1.Greetings2.Drills:T: What do you usually do on weekends ?S1: I usually play soccer .T: How often do you play soccer ?S1: I play soccer twice a week .T: How often does he play soccer ?The other Ss: He plays soccer twice a week .Repeat for three times .Step 2 Pre-taskSB Page 2 ,Grammar Focus .1.Review the grammar box .Ss say the questions andanswers .2.Practise reading .Step 3 While-taskSB Page 3 , Part 3 .1.Call attention to the survey .Make sure the Ssunderstand the chart .T: What activity do ninety-five percent of Green High students do every day ?Ss answer .If necessary , give them help .2.Review the information in the green box with Ss .3.Read the article first by the Ss .4.Read it to the class .5.Look at the survey and fill in the blanks in the article .6.Finish the activity individually .7.Check the answers .8.Practise reading .Step 4 Post-taskSB Page 3,Part 4 .1.T: What can you do to improve your English ?(e.g. readEnglish books, practice reading and speaking ) How often do you ··· ?2.Think of more things you can do to improve yourEnglish and write them here .3.Ask several Ss each question .4.See: Who is the best English students in the classHomework:Revise the new words .教学后记Period 3Teaching procedures :Step 1 Leading in1.Greetings & free talk .2.Practise reading the article in Page3.3.Check the homework.Step 2 Pre-taskSB Page4 , 1a .1.Point out the five phrases .2.Ss read after the teacher .3.Make sure the Ss understand what do they mean .4.Call attention to the pictures .Say something about thepictures .5.Match the words with the pictures .6.Check the answers .7.Practice reading .Step 3 While-taskSB Page 4 , 1b .1.pay attention to the conversation in the box on theright .2.2.Read it to the class .3.Explain : “be good for” means :有益于…，对…有好处.4.Pairwork. Choose a new partner .Use the words inActivity 1a to make conversations .5.Share the students’ conversations.SB Page 4 ,2a&2b .1.T : Now you will hear a reporter interview twopeople ,Katrina & Bill .Read the two names for the Ss.In 2a ,we’ll know who is healthy , Bill or Katrina ?2.Read the questions in 2a .3.Listen to the tape carefully twice .Circle “yes” , “no”or “I don’t know” in the chart .4.Before we check the answers in 2a,we’ll read throughthe questions in 2b .Pay attention to Katrina’s and Bill’s answers .5.Play the tape again .This time ,if we have heard onequestions and we have a pause .Make sure Katrina’s and Bill’s answer.6.From the answers in 2b ,we can tell who is healthy Billor Katrina ?Step 4 Post-taskRole-play .Groupwork .Divide the Ss into groups of three .S1 is interview,S2 is Katrina ,S3 is Bill .S1: How often do you exercise ?S2: I exercise every day .S3: … .With the help of 2b .Homework请同学们用2b里面的问题调查你熟悉的两位同学，写出答案并做比较.教学后记Unit 2 What’s the matter ? Teaching goals:1.词汇.让学生熟记这些单词，能够很熟练地指出表示身体部位的某些单词.2.能够用所学的单词谈论身体并且能给出中肯的建议.3.通过听力练习，争取能够提高学生的听力能力.4.文化欣赏，中国文化.Important and difficult points:1.words .2.How to talk about the health and give the advice .Period 1Teaching procedures:Step 1 Leading in1.T :How many parts of the body can you name ?What’s this ?(head , mouth etc.)Toda y we’ll learn some parts of the body .2.This is my head .Oh ,I have a headache .Step 2 Pre-task1.Read the new words by the Ss first .2.Then check the Ss if they can read the new words bythemselves correctly .if there is a mistakes ,correct .3.Practice reading the new words .Give them 6 minutes .4.Have a competition between boys and girls .Write thewords you remembered just now on the blackboard . 5.Page7,1a.Do this part by the Ss first. Write the correctletter after the name of each body part on the list .6.Check the answers .7.Play a game .All the Ss close your books ,we’ll have ainstructor to say :Touch your nose /head /right ear … .Let’s see which student do it correctly and quickly .First all the Ss do this game .Then have competitions between boys and girls .5 boys and 5girls to the front to do what the instructor said .if you are wrong ,please go back to your seats ,the last one who stands at the front is the winner .Step 3 While-taskSB Page 7, 1b .Listen and check the answers .SB Page 7,1c .Work in pairs and act out .SB Page 8, 2a .1.Point out the eight items in this activity .Read the itemto the class .Ss repeat .2.There are different conversations .Listen carefully .people are talking about health problems they have and getting advice .3.Match the problems with the advice .4.Play the tape twice .5.Check the answers .Step 4 Post-task同桌之间设计一个医生与病人之间的对话.Step 5 Homework1.Remember the name of your body part .2.Write conversations between the doctor and thepatient .教学后记Period 2Teaching procedures :Step 1 Leading in1.Free talk .2.Revise playing the game .3.Practice reading the dialogues .Step 2 Pre-taskSB Page 8, 2b .1.Pay attention to the four pictures .Each of thesepictures illustrates one of the conversations .2.Play the tape ,write the missing words on the blanklines .3.Play the tape again and check the answers .4.Pairwork .Practice reading the dialogues in thepictures .Take turns having the problem and giving the advice .5.Practice reading the dialogue in 2c ,and make their onwconversations .6.Act out the dialogue .Step 3 While-taskSB Page 9, 3a .1.Point out the picture and ask Ss to describe it .(There isa boy sitting on a bench .He’s sick .A teacher is talkingto him )2.Pay attention to the dialogue and the blanks in thedialogue .3.Fill in the blanks in the conversation .4.Go over the answers.5.Practice reading the dialogue with a student, then workin pairs .Step 4 Post-taskSB Page 9 , 3b .1.Look at the picture with activity .A: What’s the matter ?B: I’m not feeling well . I have a t oothache /fever/sore throat /sore back .2.Pairwork.Make your own dialogues setting 3a as an example .3.Act out the dialogue .Ask some pairs to come to thefront to act out their onw dialogues .SB Page 9, Part 4.1.Read the instructions and demonstrate what a “mime”is .2.Read the dialogue by the Ss .3.Ask a student to come to the front and mime anillness ,the other Ss guess what the illness is .4.Ask one student to give advice .5.Give several students an opportunity to come to thefront and mime an illness .Step 5 Homework1.When you had some problems.please remember whatthe doctor said .2.Remember the new words .教学后记教案正文随堂记录Period 3Teaching procedures :Step 1 Leading in1.Free talk .2.Play the game :One student mimes an illness , the otherstudents guess the illness and give advice .What’s the matter? Do you have a sore throat ?Step 2 Pre-taskSB Page 10 ,1a .1.Look at the picture .Point out the four new words andexpressions .Say each word and ask Ss to repeat .2.The first picture .Explain something about it using oneof the four words and expressions .3.Match the words with the pictures by the Ss .4.Check the answers .5.Practice reading and make sure the Ss understand themeaning of the words .Step 3 While-taskSB Page 10,1b .教案正文随堂记录1.Read the four sentences ,Ss practice reading .2.Look at the picture and match each picture with advice.3.Check the answers .SB Page 10 ,2a & 2b .1.First ,make sure the Ss understand what they will hear .2.Then read the four names3.Listen and write the problems on the bland lines .Ifpossible ,write what each person “should” and“shouldn’t” do for their problem.4.Check the answers .Step 4 Post-taskSB Page 10,2c .1.Ask two students to read the conversation to the class .2.Pairwork .Make conversations with your partner .3.Act out the conversations for the class .4.Write two dialogues in the exercise book .SB Page 11, 3a &3b .1.3a .Read the article and underline the things you shoulddo . Check the answers .教案正文随堂记录2.3b .Let the Ss read the paragraph and fill in theblanks .Check the answers .SB Page 11 ,Part 4.Play the gameStep 5 SelfcheckSB Page 12 ,Part 1 .1.Fill in the blanks on their own .2.Make your own sentences with the words .SB Page 12,Part 2.Read the letter .Make sure Ss can understand it .Step 6 Homework1.Remember the words in this unit .2.Do the exercises on Pages 6-8of the workbook .教学后记教案正文随堂记录Unit 3 What are you doing forvacation ?Teaching goals :1.Words & phrases: babysit ,get back , fishing , rent ,think about , decide(on) , tourist etc.2.How to talk about future plans .3.现在进行时表示将来计划或行动.4.特殊疑问句（where , when , how long引导）Important and difficult points :Drills :What are you doing for vacation ?I’m watching TV .When are you going ?I’m going … .How long are you staying ?We’re staying for five days .Teaching aids : cards and a tape ,a large wall calendar .Period 1Teaching procedures :Step 1 Leading in1.Free talk .2.Put up the wall calendar .T: I’m staying home on Saturday (pointing to next Saturday ). Ss repeat .Ss: I’m staying home on Saturday .T: OK. Today we’ll learn how to talk about future plans.Step 2 Pre-taskSB Page 13 , 1a .1.Look at the picture carefully and tell what you see inthe picture .2.Write the activities from the pictures in the box and addsome more .3.Practice reading .Step 3 While-tasking the activities we write in 1a to makeconversations .For example :What are you doing for vacation ? I’m visiting my uncle .2.Pairwork .Practice in pairs .3.用第三人称练习对话.4.Groupwork . Divide the Ss into groups of four orfive .Make conversations .5.Listening Page 13,1b. Check the answers .SB Page 14 ,2a & 2b .1.First ,read the names of the people .2.Play the recording and let Ss fill in the chart .3.Check the answers .Step 4 Post-taskSB Page 14,2c .Read the conversations first .Groupwork and fill in the chart .Step 5 Homework1.如果没填完上面的表格回去接着做完.2.记单词.教学后记Period 2Teaching procedures :Step 1 Leading in1.Free talk .2.Revise : Make conversations with the setences what areyou doing for vacation ?When are you going ?Who are you going with?Step 2 Pre-taskSB Page 14,Grammar focus .1.Call attention to the sentences together .Read them bythe Ss .Ask a student to say the question using the word he and then again using a boy’s name .2.Do in the same way with “she” and a girl’s name. Step 3 While-taskSB Page 15, 3a .1.Read the conversation by the Ss and practice reading .2.Listen and fill in the chart .3.Check the answers .SB Page 15, 3b .1.Look at the conversation in the box .2.Practice reading .3.Pairwork . Make conversations using the information in3b .4.Act out your conversations .Step 4 Post-taskVacation Dreams .Imagine your dream vacation .Write something on a piece of paper using what we learnt . Share the dreams .Step 5 HomeworkWrite 2 conversations about 3b in the exercise books .If you don’t finish your dream writing, do it at home .教学后记Period 3Teaching procedures :Step 1 Leading in1.Free talk .2.Check the homework :Ask one or two Ss to saysomething about their dream vacation .并给出全适的评价.Step 2 Pre-taskSB Page 16, 1a .1.Say each phrase and ask Ss to repeat .2.Call attention to the pictures .Say something about thepictures .Match each phrase with a picture .3.Check the answers .Step 3 While task1.Make conversation. Work with your partner .Talk aboutwhat you would like to do on vacation .2.Share their conversations.SB Page 16 , 2a&2b .1.Read the reporter’s questions together .2. Play the recording and check the answers .Step 4 Post-task1. Find a new partner .Student A is the reporter .Student B is He Yu . A interview B .2. Read the conversation in 2c and with the help of thelistening .Step 5 Homework1. Remember the new words .2. Write the conversations about your interview .教学后记Period 4Teaching procedures :Step 1 Leading in1.Greetings .2.Make an interview with a student .Step 2 Pre-taskSB Page 17 ,Part 4 .T: What are you doing this weekend ?1.Ask each other ,write down their answers .2.One student to present his /her exercise .Step 3 While-taskSB Page 17 , 3a .1.Read the article about Ben Lambert’s vacation plans bythe Ss .Tick out the new words .2.Read the article to the class .3.Explain the new words .4.Play the tape .Ss listen and repeat .5.Point out the five numbered pictures .Ss identify theitems .6.Check the answers .7.Play the tape again .Practice reading .SB Page 17, 3b .T: This is an article about Julia’s vacation plans .Call attention to the blanks in the paragraph .Read the paragraph to the class ,saying blank each time when we come to a bland line .Read the paragraph and fill in the blanks .Step 4 Post-taskSB Page 17 , 3c .T: We read about Julia’s vacation and Ben’s vacation .If you are a famous singer or football player ,What are your vacation plans ?Write about your vacation plans .Give them help if they need .Step 5 HomeworkComplete the Selfcheck .教学后记Unit 4 How do you get to school? Teaching goals :1.Words & phrases: get to , how far , bicycle , subway ,minute , mile , bus stop .2.Talk about how to get to places (谈论出行方式)take the bus /subway /train /taxi , ride a bike /walk . 3.how引导的特殊疑问句，表示乘坐何种交通工具的方式.how far ,how long 引导的特殊疑问句.4.复习基数词及时间的表示方法.5.了解中外文化的差异.Important and difficult points :1.how /how far /how long 引导的特殊疑问句.2.乘坐交通工具的表示方法.3.It takes /will take/took sb some time to do sth . Teaching aids: cards and a tape-recorder .Period 1Teaching procedures :Step 1 Leading in1.Greetings and free talk .3.T: How do we get to school ? Some studentswalk ,some students take the bus ,some students ride a bike .Does anyone take the subway ? No , we have no subway .OK ,today we will learn Unit 4 .Explain : get toStep 2 While-taskSB Page19 ,1a&1c .1.Write down how you get to school .2.Look at the picture .Write down how the students get toschool.3.Make dialogues with the phrases .4.Groupwork: Divide the students into groups of three orfour .Practice reading the dialogues.5.Act out their dialogues .SB Page 19 , 1b .Listening1.Make sure the Ss know what ot do .Give them anexample orally if possible .2.Read the names .3.Play the tape and check the answers .SB Page 20 , 2a&2b .1.Revise the numbers .2.Teach the new word :minute .3.Play the tape for the students to finish 2a&2b .Thenplay again and check the answers .Step 3 Post-taskIf there is time ,make conversations .Step 4 Homework用对话的形式告诉老师你是怎么到达学校并需要多长时间，then please tell me how you get to school and how long it takes .教学后记Period 2Teaching procedures :Step 1 Leading in1.Greetings .2.Check the homework .3.Go over the dialogue in Page20 ,2c .Step 2 Pre-taskSB Page 20 ,Grammar focus .1.Review the grammar box .Ask students to say thestatements and responses .2.Practice reading .3.Explain the usage of “take” in “take the train” and“take sb some time to do sth” .Step 3 While-taskSB Page 21,3a .1.Pay attention to the speech bubbles .Read thequestions .2.Read the passage by the Ss. Find the answers to thequestions and write the answers on the lines .3.Check the answers .SB Page 21, 3b .1.Show Ss the example in the box .Two students read itto the class .2.Pairwork: Make your own conversations using theinformation in the left box.3.Ask some pairs to present the conversations to the class Step 4 Post-taskSB Page 21 ,Part 4 .Groupwork.Divide the Ss into groups of three .In each group ,one is A,who look at Page 21.One is B,who look at Page 85,the other is C,who look at Page 86 .Fill in the blanks .The group who fill in the blanks first wins .Step 5 HomeworkWrite two conversations in 3b in the exercise books .教学后记Period 3Teaching procedures :Step 1 Leading in1.Greetings and free talk .2.Check the homework.3.Go over the passage in 3a Page 21 .Step 2 Pre-taskSB Page 22 ,1a .1.Say the four new phrases and Ss repeat .2.Match the words with the pictures .3.Check the answers .Step 3 While-taskSB Page 22,2a&2b .1.Play the tape for the students to finish them .2.Point out the two sets of pictures with a blank line infront of each .3.Check the answers .SB Page 22, 2c .Talk about how Nina gets to school . Step 4 Post-taskSB Page 23, 3a .1.Read the instructions to the class and read through thestatements abut the article .2.Read the article again by the Ss .Write if the statementsare true or false in your exercise books.3.Do the activity individually and check the answers . SB Page 23 ,3b .Read the article and fill in the blanks .Check the answers. Selfcheck Part 2 .1.Look at the picture .Make sure what the people in thepicture doing .2.Finish the conversation .3.Practice reading .Step 5 Homework1.Write a newspaper article .2.Go over this unit .教学后记Unit 5 Can you come to myparty ?Period 1Teaching contents :Section A:1a , 1b ,1c ,2a ,2b. Teaching goals :1.vocabubary: lesson , hey , baseball game ,test , piano ,guitar , aunt , concert , party .2.Patterns: Can you come to my party ?zSure, I’d love to .Sorry ,I can’t . I have to … .3.能力目标:学会邀请别人以及回答的方式.4.情感目标:培养学生礼貌用语的习惯.Teaching procedures :Step 1 leading inPlay the song : Happy birthday .Say ,today it’s Meimei’s birthday .She wants to inv ite you to her birthday party .Can you tell me what she should say ?Ask students to say .Step 2 Pre-taskPage 25 ,1a ,1b .Ask ,Can you come to my party ?Ask some students to answer .Ask the students who say I can’t go to say why .Call attention to the words in Activity 1a. Read together . Say ,look at the picture .Ask Ss to tell what they see in each scene .Match the words with the picture and check the answers . Say ,now listen to the recording .Write the name of each person next to his or her picture .Play the recording .Ask Ss to complete the activity individually .Correct the answers .Step 3 While-taskSB Page25 , 1c.Point to the example in the box .Ask Ss to do a practice with partners .Ask some groups to act .Game:One student invite some students to his/her party .The other students answer .SB Page 26, 2a .Point to the five sentences .Say ,listen to each conversation and then circle the word that makes the sentences correct .Play the recording .Check the answers .SB Page 26 ,2b .Call attention to the five sentences in activity 2a ,ask a student to read these sentences to the class saying the correct word “can” or “can’t” .Say ,now listen to the recording again .Write the number of the conversation (1 through 3) in front of the reasons . Play the recording .Write down these answers .Check the answers .Step 4 Post-taskSB Page 26 ,2c .Call attention to the points listed in activity 2b .Ask students to make their own conversation like the example .As students work ,move around the room and monitor . Ask some students to present their dialogue .Step 5 HomeworkPractice :Invite your friends to come to your party .Write down their answers .教学后记Period 2Teaching contents :Section A Grammar focus , 3a , 3b , 4 .Teaching goals :1.vocabulary : whom , start , join , practice , math test ,mall , calendar .2.Patterns : Can you go to the mall this week ?Can she/he/they go to movies ?3.能力目标:学会写请贴，会制做日程表.4.情感目标:学会人际交往的基本常识.Teaching procedures :Step 1 Leading inAsk :How many people did you invite yesterday ?What did they say ?Ask one student to show his answer .Step 2 Pre-taskSB Page 26 , Grammar focus .Review the grammar box .Ask Ss to say the questions and answers .Talk about the two ways people give reasons for saying no to an invitation .Call attention to “has to” and “have to” ,under the words write “I’m ing , and she’s ing .”Step 3 While-taskSB Page 27 , 3a .Call attention to the invitation .Ask questions about it .eg.What kind of invitation is it ?Call attention to the dialogue .Ask a pair of students to read it to the class ,saying blank each time they come to a blank line .Ask students to fill in the blanks according to the invitation .Check the answers .SB Page 27 , 3b .Ask two students to act the conversation you just completed .Call attention to the blank invitation card .Complete this card .Ask some pairs to present their conversations to the class . Step 4 Post-taskSB Page 27 ,Part 4 .Read the instructions for this activity to the class .Read the dialogue with a student .Point out Eliza’s calendar on page 27 and Lu Qing’s calendar on Page 87.Ask students to make conversations.Discuss the answer with the class .Step 5 Homework1.Make your own calendar .2.Make an invitation .教学后记Period 3Teaching contents: Section A 1a,1b,1c,2a,2b,2c. Teaching goals:1.vocabulary:Sunday ,Monday ,Tuesday ,Wednesday ,Thursday ,Friday ,Saturday ,tomorrow .2.Pattern: Can you play tennis with me ?What’s toda y ?3.能力目标:能训练地用英语和别人进行交际. Teaching aids :Step 1 Leading inAsk the student who is on duty to say something to the class .Step 2 Pre-taskSB Page 28 ,1a , 1b .Show the days of the week in a large monthly calendar . Point out the days of the week at the top of the calendar and ask a student to read these words aloud .Ask a student to point out today’s date ,tomorrow’s date ,the day after tomorrow’s date and yesterday’s date.Complete activity 1a ,check the answer .Ask students to write the words today ,tomorrow , yesterday and the day after tomorrow in the correct spaces on the calendars in their books .Step 3 While-taskSB Page 28, 1c .Call attention to the example in the box .Ask two students to read it to the class .Ask Ss to work in pairs .Ask :What do you want to do on Monday , Tuesday … ? Write down your answers .Make some conversations with your partner .Ask some Ss to present their conversations .SB Page 28, 2a, 2b .Point to the picture .Listen to the conversation .Can Vince play tennis with Andy ?Circle “yes” or “no” .Play the recording .Ask what can Vince do today .Pay attention to the list of five activities ,and the threelettered words .Point out the sample answer ,say, Number 1 is b ,that means that Vince is playing soccer tomorrow .Play the recording .Correct the answers .Step 4 Post-taskSB Page 28, 2c .Help student find partners .Say ,one student is Andy ,the other is Vince .Ask the pairs to practice for a few minutes like the example.Ask some pairs to present their conversation .教学后记Period 4Teaching contents :Section B 3a, 3b ,3c ,4, selfcheck . Teaching goals :1.vocabulary: e-mail message , invitation , science ,match ,whole ,come over to ,till2.Patterns: Thank you for your invitation. I’m sorry Ican’t . I have to … .3.能力目标:学会以“邀请”为主题的书面表达形式，弄懂E-mail 的写作法.4.情感目标:理解“义务”涵义.Teaching aids : tape , tape-recorder , cards . Teaching procedures:Step 1 Leading inShow an article to the class .Say ,this is a e-mail message .Call attention to the form .Read the article individually .Step 2 Pre-taskSB Page 29 ,3a .Say ,there is another e-mail message .Ask a student to read it to the class .Call attention to the blank calendar .Say ,Now read it again .Then complete S onia’s calendar . Check the answers .Step 3 While-taskSB Page 29 ,3b .Point out the e-mail message .Ask a student to read it aloud .Say ,Fill in the blanks in the e-mail message ,use “I’m+verb+ing” or “I have to +verb”.Ask students to complete the activity on their own .Ask some Ss to present the answers to the class .SB Page 29 ,3c .Say ,now write your own e-mail message to a friend .say why you can’t visit next week , give some reasons you wish .As Ss work ,move around the room monitoring their work. Ask some Ss to read their message to the class .。