八年级上册英语时态精讲精练现在进行时一．基本用法⑴表示说话时正在进行的动作，常与now, at the moment等时间状语连用，有时，句首有look ，listen等词提示。
例如：What are you doing now? — I am cleaning the window.Look! The students are having an English lesson.⑵表示现阶段正在进行的动作，常与now, these days等时间状语连用。
例如：1.He is now living in Australia. 目前他正住在澳大利亚。
（暂时）。
比较：2.He lives in Australia. 他定居在澳大利亚。
3.I am working in a computer company right now.How are you getting along these days? 这些天来你好吗？⑶有时，现在进行时可以表示按计划安排将要发生的动作，特别是使用表示位置转移的动词时，如go, come, leave, start, arrive等。
例如：We are going to Rome next week. 下周我们准备去罗马。
When are you starting? 你什么时候动身？二．动词的现在分词的构成：其动词结构为：be + doing（动词的现在分词）1 一般情况动词后加ing ,以不发音的e结尾的去e加ing。
write- play- eat- see-2 以重读闭音节结尾的词，双写最后的辅音字母再加ing这样的词往往看最后三个字母，常常是“辅音＋元音＋辅音”open就不行,它的重音不在pen上sit- get- begin- stop-shop- swim- run-三.句子结构肯定结构：主语＋am/is/are＋doing（动词的现在分词）He is watching TV.否定形式：主语＋am/is/are+ not+ doing.He is not watching TV.一般疑问句：Be（am/is/are）＋主语＋doing（动词的现在分词）?Is he watching TV? Are they singing now?特殊疑问句：疑问词＋一般疑问结构？What is he doing?现在进行时专项练习一. 用括号中动词的适当形式填空：1. My parents ___ ____(watch)TV now.2 . Look. Three boys ___ ____(run).3. What _______ your mother ___ ____(do)now?4. _______ your dog _______ now?(sleep)5. _______ you _______(listen)to music? Yes, I am.6. Look, Miss Chen ___ ____ football.(play)7. Tom and his sister _______(wait)for you over there.8. Now Class 3 and Class 4_______(have)a test.9. Listen, someone _______(sing)in the classroom.10. ——Where is Zhang Yan?——She _______(talk)with her teacher in the teacher’s office.二. 选择填空：( )1. Who ______ over there now?A. singingB. are singC. is singing( )2. It’s nine ten. The students ______ a music class.A. haveB. havingC. are having( )3. Listen! The boy _______. A. crying B. is crying C. cries ( )4. Don’t talk here. Grandparents ______.A. sleepB. is sleepingC. are sleeping( )5. Is the man _______ tea or milk?A. drinksB. drinkC. drinking三. 按要求进行句型转换：1. Lily is dancing.(改为一般疑问句)________________________________________________2. Kate is looking for her watch.(改为否定句)________________________________________________3. Mrs. White is watching TV.(对划线部分提问)________________________________________________4. I am doing homework.(改为否定句)________________________________________________5. They are waiting for you at the library.(提问)___________________四. 根据中文提示完成句子：1他没在写作业，她在画画。
He _____ ____ __ homework. He __ __ ___ __ pictures. 2. 今天李老师穿着一件红色的连衣裙。
Miss Li ______ ______ a red dress today.3. 你爷爷在看报纸吗？______ your grandpa ___ ___ the newspaper?4. Tom和Jim在做什么？______ ______ Tom and Jim ______?5. 他们是在打篮球还是在打排球？______ they ______ basketball ______ volleyball?一般现在时一．用法1.表示现在的状态He is twelve. They are at home.2.表示经常性或习惯性的动作I go to school at seven every day.He plays soccer on Sundays.3.表示主语具备的性格和能力等She likes apples. They speak Japanese. She is medium build.二．句子结构1.主语＋be＋其他2. 主语＋动词原形＋---3. (当主语是第三人称单数时)主语＋动词的第三人称单数形式＋---肯定式I am a cleaner.We go to school at seven every day.He goes to school at 6 every day.否定式I am not a cleaner.We don’t go to school at seven.He doesn’t go to school at 6.疑问式及回答Are you a cleaner? Yes, I am. (No, I’m not.)Do you go to school at seven? Yes, we do.（No, we don’t.）Does he go to school at 6? Yes, he does.（No, he doesn’t.）注意：在上面的否定和疑问式中，do和does都没有意义，不用译出。
它们只是为了使句子完整，叫做助动词。
三．其他特征：A.一般现在时常和表示时间频度的副词连用。
如：often, usually, sometimes, always, never, hardly ever等。
（注意频度副词的位置：）1. I often read books in the evening2. Do they usually go to school by bike?3. He doesn’t like milk. He never drinks it.4. Sometimes my mother gets back at five.B.一般现在时常和以下时间表达法连用。
如：in the morning, in the afternoon, in the evening, at noon, at night, every day, on Sunday(s), at seven 等。
Do they have math in the morning?She sleeps nine hours every night.They don’t have classes on Sundays.动词第三人称单数的构成：1、直接加--s look—looks read—reads play—plays2. 在字母s, x,ch,sh,o后加--eswatch—watches wash—washes go—goes do—does3. 辅音字母加y结尾的动词变y为i，再加--escarry – carries study – studieshurry – hurries cry – cries4. 特殊的have -- has一般现在时专项练习选择填空() 1.A: How often ______ she exercise? B: Twice a week.A. doB. doesC. doingD. did() 2. I ______ like to drink milk.A. notB. doesn’tC. don’tD. no() 3. Good food and exercise ______ me to study better.A. helpB. helpsC. helpingD. to help() 4. Is her lifestyle the same ______ yours or different?A. asB. inC. atD. to() 5. I like ____ for breakfast.A.a bookB. a rulerC. an eggD. a sofa() 6. The ____are $21.A. glassesB. shoeC. tableD. bike() 7. Tennis ____ my favorite sport.A. areB. isC. amD. be() 8. I have a tennis and my friend Jim ____ two tennis rackets.A. haveB. playC. playsD. has() 9. “Let’s play computer games.” That ____ interesting.”A. looksB. soundsC. listensD. reads()10. My father likes football. But he ____ it.He only ____ football matches on TV!A. plays, watchesB. play, watchC. doesn’t play, watchesD. plays, doesn’t watch一般过去时意义：表示过去某个时间或某阶段已经发生或完成的动作或状态，和现在无关。