八年級英語上冊Unit9Canyoucometomyparty語法講解素材(新版)

1、Un it 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】1. can 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Can you go with me?表示請求、能不能，可不可許可以，相當(dāng)于 may,你能和我一起去嗎？表示能力但沒有 mayE 式。能，會He can swim , but I cant.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 cant be at school now.王

2、老師現(xiàn)在不可能在學(xué)校。表示禁止不準(zhǔn)；禁止You cant smoke in the 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， rd 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 cant. Im going to visit my gra ndpa.對不起，我不

3、能去。我打算去看望我爺爺。2. have to 的用法have to 的用法例句2意為“不得不，必須”，它強(qiáng)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. He has to stay at home andlook after her.他媽媽病了。他不得由 have to 構(gòu)成的句子的否定不待在家里照顧她。Do you often have to go句、疑問句需用助動詞to work at eight?你常的適當(dāng)形式米完成常得在八點鐘上班嗎?3_have to 與 must 的區(qū)別(1) have to 意為不得不，必須，它強(qiáng)調(diào)一種

4、客觀情況。must 意為必須，著重于說話人主觀上認(rèn)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 h

5、ad to do some wash ing yesterday.昨天她不得不洗衣服。答案1.cant could could nt2.has to had to do3【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 mus

6、t obey 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 cant B.I shouldntC.I mustnt D.I dont()2. I cant stop playing computer games. For your health, my boy, Im afraid you_ A. can B. must C. have to D. may()3. Could you please close 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 neednt B. need C. cant D. can( )5.Whos the man over there? Is it MrBlack?-It_ be him. Hes much taller.A cant B. mustnt C. should D. may( )6. Mr Wang, must I come again on Sun-day morning t