初中英語情態(tài)動(dòng)詞課件.ppt

1、情態(tài)動(dòng)詞復(fù)習(xí),3) 表示推測(cè)、可能性（不用于疑問句）。,might不是過去式，它所表示的可能性比may小。 1He may /might be very busy now. 2Your mother may /might not know the truth.,can, could,1) 表示能力（體力、知識(shí)、技能）。 Can you lift this heavy box?（體力） Mary can speak three languages.（知識(shí)） Can you skate?（技能）,此時(shí)可用be able to代替。Can只有一般現(xiàn)在時(shí)和一般過去式；而be able to則有更多的時(shí)

2、態(tài)。 Ill not be able to come this afternoon. 當(dāng)表示“經(jīng)過努力才得以做成功某事”時(shí)應(yīng)用be able to，不能用Can。如： He was able to go to the party yesterday evening in spite of the heavy rain.,3) 表推測(cè)可能性。,肯定句中：can表示理論上的可能性；may表示事實(shí)上的可能性，如： In Yuyao, sometimes it can be really cold. Tom may go camping with us tomorrow, but he is not

3、sure. 否定句和疑問句中，只能用can表猜測(cè)可能性。 Someone is knocking at the door, and who can it be? It cant be Tom because he has gone to Beijing.,2) shall 用于第二、三人稱，表示說話人給對(duì)方的命令、警告、允諾或威脅。 1. You shall fail if you dont work hard.(警告) 2. He shall have the book when I finish it.(允諾) 3. He shall be punished.(威脅),五. should,

4、表示“應(yīng)該”，常用來表示勸告、建議；認(rèn)為“某人應(yīng)該做某事”或“有義務(wù)責(zé)任做某事”。 We should obey traffic laws. You shouldnt watch TV every day。 You shouldnt have made this kind of silly mistakes. Tom should have brought his report today. 這時(shí)它可以和 ought to， be supposed to 互換使用,2) Should (ought to)表示推測(cè)時(shí)，是指有一定根據(jù)的推測(cè)，意為“可能、該”,-When can I come fo

5、r the photos? I need them tomorrow, -They _ be ready by 12:00,3. 表示驚訝的語氣,You can never imagine such a gentleman should be so rude to a lady.,六： will 和would,1)表示意志或意愿：決心，愿意， We will do our best to save the child. 我們會(huì)盡力搶救這個(gè)孩子。 I told her to stop crying, but she just wouldnt listen. 我叫她別哭,可她就是不愿聽。,2)表示

6、請(qǐng)求、建議或征求對(duì)方意見時(shí)，用Would you? 比用Will you?更婉轉(zhuǎn)。如：,Will/Would you please keep the door open?請(qǐng)讓門開著好嗎？ Will/Would you go with me?你愿意和我一起去嗎?,相關(guān)情態(tài)動(dòng)詞,would like表示愿意 I would like to have a word with you. 我想同你說句話。 would ratherthan寧愿也不愿 I would rather fail than cheat in the examination. 我寧愿考不及格，也不愿意考試作弊。,七。need,1n

7、eed作情態(tài)動(dòng)詞無人稱或數(shù)的變化，后接動(dòng)詞原形，多用于否定句和疑問句中。 如：Youneedntworry.你不必?fù)?dān)心 I neednt have brought the raincoat with me in such a sunny day yesterday.,2由need引出的一般疑問句，肯定回答常用must或haveto;否定答語常用neednt.如：,NeedIanswerthequestion?我需要回答那個(gè)問題嗎？ Yes,youmust. -Yes,youhaveto.是的，你必須回答。 -No,youneednt./you dont have to不，不必了。,由must引

8、出的一般疑問句，肯定回答用must,否定答語用neednt或donthaveto。如：,MustIdotheworknow?我必須現(xiàn)在干這個(gè)活嗎？ Yes,youmust/haveto. -No,youneednt/donthaveto.,Need 做行為動(dòng)詞,Need sth Need to do sth Need doing=need to be done表被動(dòng) 否定： dont need,八：dare 敢,通常用于疑問句、否定句或條件句中 Dare you ask him?你敢問他嗎？ She dare not go out alone. 她不敢單獨(dú)出去。 I dont know whe

9、ther he dare try. 我不知道他敢不敢試。,注意：,1.有過去式dared。如： No one dared speak of it. 沒有人敢提及此事。 2. How dare you/he/she/they?表示說話人對(duì)某人的行為表示憤慨。如： How dare you ask me such a question?你怎敢問我這樣的問題? 3. I dare say表示“我相信，我認(rèn)為，可能”。如： I dare say you are right. 我認(rèn)為你是對(duì)的,作行為動(dòng)詞：可用于各種句子中；在疑問句或否定句中，to經(jīng)常被省略。如,Did anyone dare (to)

10、admit it?有人敢于承認(rèn)嗎? He did not dare (to) leave his car there. 他不敢把車停放在那里。 If he dares to show up at her house Ill be surprised. 如果他敢出現(xiàn)在她的房子里，我會(huì)感到吃驚。,注意點(diǎn)一：,表推測(cè)可能性：must, can, may, might, cant, couldnt -I heard they went skiing in the mountains last winter. - it _ true because there was little snow where

11、.,二、表推測(cè)的用法,1. must have done過去肯定做了某事 Since the road is wet, it must have rained last night. 不存在 mustnt have done 的形式。其否定或疑問形式須用 can(could) 來表示. 例如： He cant have missed the way. I drew him a map. “The dictionary has disappeared. Who could have taken it?”,may / might have done,I cant find my keys. I may / might have left them at the school yesterday. 我找不到我的鑰匙了。我可能昨天把他們落在學(xué)校了。 John may/might not have passed the exam; he looks very sad.約翰可能沒有通過考試。他看起來很憂傷。,3.can/cou