八年級英語上冊 Unit 9 Can you come to my party語法講解素材 （新版）人教新目標(biāo)版（通用）

1、unit 9 canyou come to my party?單元語法聚焦九情態(tài)動詞can, have to的用法【正面闡述】1can的用法can是一個情態(tài)動詞，其后接動詞原形，其否定形式是_，它的過去式為_ ，否定形式為_。can的用法如下：can的用法意思例句表示請求、許可“能不能，可不可以”，相當(dāng)于may，但沒有may正式。can you go with me?你能和我一起去嗎？表示能力能，會he can swim，but i can't.他會游泳，但我不會。表示推測“可能”，常用于否定句和疑問句中。mr wang can't be at school now.王老師現(xiàn)在

2、不可能在學(xué)校。表示禁止不準(zhǔn)；禁止you can't smoke inthe hall.大廳內(nèi)禁止吸煙。注意：can表示請求或用于發(fā)出邀請時，如果接受對方的邀請時常用“sure，i'd love (like) to. /certain- ly. /of course.”等回答；如不接受，常用sorry等有禮貌地拒絕，但一般情況下需要說明不能接受邀請的原因并表示歉意。如：can you come to my birthday party tomor- row?明天你能來參加我的生日聚會嗎？sorry, i can't. i'm going to visit my g

3、randpa.對不起，我不能去。我打算去看望我爺爺。2have to的用法have to的用法例句意為“不得不，必須”，它強調(diào)一種客觀情況，有單復(fù)數(shù)及時態(tài)的變化，其第三人稱單數(shù)為_，過去式為_。his mother is ill. hehas to stay at homeand look after her.他媽媽病了。他不得不待在家里照顧她。由have to構(gòu)成的句子的否定句、疑問句需用助動詞_的適當(dāng)形式來完成。do you often have to goto work at eight?你常常得在八點鐘上班嗎？3have to與must的區(qū)別(1) have to意為“不得不，必須”，

4、它強調(diào)一種客觀情況。must意為“必須”，著重于說話人主觀上認為“有義務(wù)，有必要”。如：we have to pay a fine.我們不得不交罰款。you must do it yourself你必須自己做。(2)have to有單復(fù)數(shù)及時態(tài)的變化，must無人稱、時態(tài)、數(shù)的變化。如：she has to finish her homework.她必須完成作業(yè)。she must finish her homework.她必須完成作業(yè)。(3)過去時及將來時的句子常用have to，而不用must。they had to send him to his home.他們不得不送他回家。she ha

5、d to do some washing yesterday.昨天她不得不洗衣服。答案1can't could couldn't2has to had to do【反面解讀】1人稱和數(shù)的誤用誤：he cans swim.正：he can swim.2時態(tài)的誤用誤：he can play the piano when he was eight years old.正：he could play the piano when he was eight years old.3情態(tài)動詞的誤用誤：we have to obey the traffic rules.正：we must ob

6、ey the traffic rules.【實戰(zhàn)演練】()1.can you stay here for lunch?sorry,_ .i have to see my par- ents.a.i can't b.i shouldn'tc.i mustn't d.i don't()2. i can't stop playing computer games.for your health, my boy, i'm afraid you_a. can b. must c. have to d. may()3. could you please cl

7、ose the door?yes, i_.a.can b.must c.could d.should()4. can you play the piano?yes, i_. i often practice it on weekends.a needn't b. need c. can't d. can( )5.who's the man over there? is it mrblack?-it_ be him. he's much taller.a can't b. mustn't c. should d. may( )6. mr wang, must i come again on sun-day morning to clean the windo