比較need和dare

1、比較need和dare 這兩詞既可做實義動詞用，又可做情態(tài)動詞用。作為情態(tài)動詞，兩者都只能用于疑問句，否定句和條件句。 need 作實義動詞時后面的不定式必須帶to，而dare作實義動詞用時, 后面的to 時常可以被省略。1) 實義動詞： need（需要, 要求） need + n. / to do sth2) 情態(tài)動詞： need，只用原形need后加do，否定形式為need not。Need you go yet? Yes, I must. / No, I neednt.3) need 的被動含義：need, want, require, worth（形容詞）后面接doing也可以表示被動

2、：need doing = need to be done帶to 的情態(tài)動詞 帶to 的情態(tài)動詞有四個：ought to, have to, used to, be to, 如加上have got to ,(=must), be able to，為六個。它們的疑問，否定形式應(yīng)予以注意： Do they have to pay their bill before the end of the month? She didnt use to play tennis before she was fourteen. You ought not to have told her all about i

3、t. Ought he to see a heart specialist at once.? ought to 本身作為情態(tài)動詞使用。其他的詞作為實義動詞使用，變疑問，否定時，須有do 等助動詞協(xié)助。典型例題Tom ought not to _ me your secret, but he meant no harm. A.have toldB.tellC.be tellingD. having told答案A。由于后句為過去時，告訴秘密的動作又發(fā)生在其前因，此地應(yīng)用過去完成時，但它在情態(tài)動詞 ought to 后，所以用have。情態(tài)動詞的回答方式 問句肯定回答否定回答Need you?Y

4、es, I must.No,I needntMust you?/dont have to. 典型例題1）-Could I borrow your dictionary?-Yes, of course, you_. A. mightB. will C. can D. should 答案C.could表示委婉的語氣，并不為時態(tài)。答語中of course，表示肯定的語氣，允許某人做某事時，用can和 may來表達(dá)，不能用could或might。復(fù)習(xí)： will 與you連用，用來提出要求或下命令。should與you 連用，用來提出勸告。2）-Shall I tell John about it?-

5、No, you _. Ive told him already. A. needntB. wouldntC. mustntD. shouldnt 答案A。neednt 不必，不用。 wouldnt 將不, 不會的。 mustnt 禁止、不能。 shouldnt不應(yīng)該。本題為不需要，不必的意思，應(yīng)用neednt。3）-Dont forget to come to my birthday party tomorrow.-_.A. I dont B.I wont C. I cantD. I havent 答案B.will既可當(dāng)作情態(tài)動詞，表請求、建議、也可作為實義動詞表意愿、意志、決心，本題表示決心

6、，選B。will和would注意： 1）would like； Would like to do = want to 想要，為固定搭配。 Would you like to go with me?2）Will you?Would you like? 表示肯定含義的請求勸說時，疑問句中一般用some, 而不是any。 Would you like some cake?3）否定結(jié)構(gòu)中用will，一般不用would, wont you是一種委婉語氣。 Wont you sit down?would rather表示寧愿would rather dowould rather not dowould r

7、ather than 寧愿而不愿。還有would sooner, had rather, had sooner都表示寧愿、寧可的意思。If I have a choice, I had sooner not continue my studies at this school.I would rather stay here than go home. = I would stay here rather than go home.典型例題-Shall we go skating or stay at home?-Which _ do? A. do you ratherB. would you rather C. will you rather D. should you rather答案B。本題考查情態(tài)動詞rather的用法，would rather +do sth 意為寧愿，本題為疑問句，would 提前，所以選B。had better表示最好had better 相當(dāng)于一個助動詞，它只有一種形式，它后面要跟動詞原形。had better do sth had better not do sthIt is pretty cold. Youd better pu