Practice
根据句意，用can和can’t填空。
1.Mr Green can’t smoke here, because there’s a sign on the wall. It says “No smoking.” 2.It’s very hot outside. You can wear a hat. 3.We can’t eat in the classroom, because it’s impolite to teachers. 4.I can go to bed after 22:00 on weekends. 5.The students can read books and magazines in the library.
重点短语
• • • • • • • • • ……迟到 arrive（be） late for …… 在走廊/餐厅 in the hallway/ dining hall 在教室/音乐教室 in the classroom/ music room 听（音乐） listen to (the music) 外出 go out 清洗餐具 do the dishes 铺床 make one’s bed 与某人打架 fight with sb 戴帽子 wear a hat/wear hats
战斗，
fight with sb.
同某人打架
fight the fire
救火
Explanation fight 是不及物动词，其后加上with才能接 宾语。fight with sb. 意为“与某人打架”。 如： Don’t fight with your sister again. 不要再和你妹妹打架了。 They are fighting with the enemies bravely. 他们正在勇敢地同敌人战斗。
Practice
将下列祈使句改成否定形式。
肯定祈使句 否定祈使句 1. Sit down. Don’t sit down. 2. Come in. Don’t come in. 3. Eat at home. Don’t eat at home. 4. Listen to music outside. Don’t listen to music outside. 5. Do your homework at school. .Don’t do your homework at school.
4.You didn‘t have to wait for me yesterday. 昨天你没有必要等我。
用have to或has to填空 1.We have to clean our classroom after school. 2.She has to make her bed after getting up. 3.It’s late. Mr Beckman has to go to work by car. 4.Emily and Peter join a music club. They have to practice guitar every day.
拓展
祈使句
2．第一、三人称祈使句是以第一人称和第 三人称代词或者名词等作为祈使的对 象，这类祈使句通常以let为引导词表建 议。如： Let’s go! Let us go home! Let him be here by 10 o’clock．
拓展
祈使句
二、祈使句的强调形式及否定形式 1.祈使句的强调形式是在整个结构之前加 do。如： Do give my regards to your parents! 务必／一定代我向你父母问好! 2.祈使句的否定形式是在整个结构之前加 don’t或never。如： Don’t be nervous!你不要紧张!
A:Do you have to wear a uniform? B:Yes ,I do./No,I don’t. have to:不得不,必须
1.I have to get up early on Monday morning.
2.Jim has to help his mother do some cooking. 3.I had to cook for my sister last night.
School Rules
Don’t fight.
School Rules
Don’t talk in class. Don’t talk with each other in class.
School Rules
Don’t sleep in class.
School Rules
Don’t use mobile phone in class.
Notes :
1 arrive in / at + 地点
get to +地点
reach +地点 (到达某地方 )
2 class 班 ，课 在课堂上 上课
in class
have classes
be late for class
上课迟到
• on time 准时 in time 及时 • 他每天准时到校。 • He gets to school on time everyday • 她及时赶到了医院。 • She reach the hospital in time. inside 里面的；在里部的 • be strict with sb. • 他爸爸对他很严格。 • His father is strict with him.
School Rules
Don’t arrive late for class.
School Rules
Don’t run in the hallways.
School Rules
Don’t eat in the classroom.
School Rules
Don’t listen to music in the classrooms or the hallways.
_______ to do theds? Does Mary ________ have 3.They have to get up at 5:30 every morning. (划线部分提问) When do ______ _______ they have to get up? 4. I can see some books on the desk? (改为否定句) any I_______ books on the desk. can’t see _______ 5. How was the weather yesterday?（改为同义词）
have to意为“必须；不得不”，后接动词原 形，有人称、数和时态的变化。 它的第三人称单数形式为has to， 过去式为had to。 含have to, has to, had to的句子需分别借 助助动词do, does, did构成疑问句和否定句。 如： She has to go there by bus. (改为一般疑 问句) → Does she have to go there by bus? They had to get up early. (改为否定句) → They didn’t have to get up early.
Unit 4
Don’t eat in class.
New words
hallway
走廊；过道
New words
classroom
教室
New words
rule
规则
New words
dinning
饭厅；餐厅
New words
fight
打架；争吵
Don’t fight . fight
不要打架． 斗争， 作战
have to的用法
1. have to句式
肯定式: have/has to + 动词原形 We have to leave now. She has to work on Sunday. 否定式: don’t/doesn’t have to + 动词原形 You don’t have to walk. He doesn’t have to buy a new coat. 一般疑问式: Do/Does + 主语 + have to + 动词原形 + …?
拓展
情态动词can的用法
用于疑问句中用来提出要求。例如： Can you...？“请你……好吗？”表示说话 人的请求。 Can I...？“我可以……吗？”用来征求对 方是否允许自己做某事。如在句末加上 please一词就显得更有礼貌了。例如： Can you help me, please? 请你帮助我好吗？
School Rules
Don’t smoke. (No smoking)
We can’t rule the country without rules.
没有规章制度就不能治理好国家.
follow the rules 遵守规则 keep rules break rules 违反规则 school rules 校规 class rules 班规 family rules 家规 library rules 图书馆规则 dining rules 就餐规则
拓展
情态动词can的用法
1. 表示能力（如体力和脑力方面），意为 “能；会”等。例如： Can you speak English? 你会讲英语吗？
2. 表示请求或允许，多用在口语中，意为“可以； 能”等。例如： Can I help you? 我能帮助你吗？ 用于否定句表示不允许。例如： You can’t play basketball. 你不能玩篮球。
拓展
情态动词can的用法