高中英语必修3unit2-语法b3unit2Grammar课件.ppt(纯ppt,可能不含音视频素材)
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1、Discovering useful structures-Modal Verbs(II)Unit 2Healthy eatingRead the text and find out the sentences containing modal verbs1.Then usually by lunchtime they would all be sold.2.By now his restaurant ought to be full of people.3.What could have happened?4.Nothing could be better 5.Something terri
2、ble must have happened if Li Chang was not coming to eat in his restaurant as he always did.6.He could not believe his eyes.7.Perhaps he should go to the library and find out.8.He could not have Yong Hui getting away with telling people lies!9.Even though her customers might get thin after eating Yo
3、ng Huis food 10.They would become tired very quickly.11.he could win his customers back.Modal Verbs(II)ought(oughtnt)to/should(shouldt)have to/must need/dare can/cantn“应该,要应该,要”,无人称时态和数的变化,无人称时态和数的变化 He ought to come tomorrow.否定式否定式ought not to(oughtnt to)疑问式疑问式Ought sb to?He ought not to be so care
4、less.Ought he to see the doctor?n表推测,按理应该,非常可能表推测,按理应该,非常可能If he started yesterday,he ought to be in Shanghai now.如果他昨天出发的话,现在应该在上海了。如果他昨天出发的话,现在应该在上海了。ought toought(oughtnt)to&should(shouldnt)表责任或者劝告表责任或者劝告“应该应该”,后者语气较强,后者语气较强There is something I ought to tell you before you leave.在你们离开之前我有事要告诉你们。在
5、你们离开之前我有事要告诉你们。You should have a rest after sports.运动之后你应该休息一下。运动之后你应该休息一下。had better 口语中常用,表示最好(做或不做某事)口语中常用,表示最好(做或不做某事)You had better stay here.你最好呆在这里。n“不得不不得不”有人称、时态的变化有人称、时态的变化 Tom has to attend an important meeting this afternoon.今天下午汤姆不得不参加一个重要的会议。今天下午汤姆不得不参加一个重要的会议。have(got)toMust they do?Y
6、es,they must.No,they neednt/dont have to.must have to主观客观主观客观主观主观 客观客观时态时态 现在,将来现在,将来 多种多种表推测表推测询问意愿询问意愿否定意义否定意义mustnt禁止,不允许禁止,不允许dont have to 不必不必(相当相当neednt)nneed“需要需要”和和dare“敢敢”既可用作情态动词,也可既可用作情态动词,也可用作实义动词。用作实义动词。n作情态动词作情态动词主要用于否定句和疑问句。主要用于否定句和疑问句。You neednt telephone him now.She dare not go out
7、alone at night.n作实义动词时,可用于各种句式。作实义动词时,可用于各种句式。You dont need to do it yourself.We need to tell them the news.He did not dare(to)look up.nI dare say为固定习语为固定习语“我想,很可能,大概我想,很可能,大概”I dare say hell come again.大概他将会再来。大概他将会再来。dare&need注意对注意对need问句的回答问句的回答:-Need I finish the work today?-Yes,_.No,_.No,_.you
8、mustyou needntyou dont have toneednt 对其它情态动词的回答对其它情态动词的回答:-Shall I tell John about it?-No,you _.-No,you _.-Must we do it now?-No,you _.-No,you _.needntdont have toneedntdont have tocan&cant(could&couldnt)1.表示能力 2.表示可能He can(not)swim across that river.表可能时,can 常用于疑问句或否定句中-Can the news be true?-No,it
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