情態(tài)動(dòng)詞用法歸納總結(jié)

1、課題：_,情態(tài)動(dòng)詞,2,情態(tài)動(dòng)詞本身有詞義，表示說話人對(duì)某種動(dòng)作和狀態(tài)的看法，但不能獨(dú)立作謂語，和動(dòng)詞原形一起構(gòu)成謂語，情態(tài)動(dòng)詞沒有人稱和數(shù)的變化。 情態(tài)動(dòng)詞的基本形式,can,must,may,need,had better,can 用法 1）表示能力，與be able to同義，但can只用于現(xiàn)在時(shí)和過去時(shí)， be able to可用于各種時(shí)態(tài)。 Two eyes can see more than one. 注：Can you ? Yes, I can / No,I cant. 2) 表示允許、請(qǐng)求 用could比can 語氣更加委婉客氣，常用于could I /you .?句型中， 若

2、表示同意時(shí)，用can回答而不用could . Could I borrow the book ? No, you cant . 3）表示推測 “可能”常用于否定句或疑問句中。（cant表示一定不 是）肯定推測中一般用could而不用can. It cant be true . Can it be true ? It could be Carlas.,2. may 用法 1）表允許，請(qǐng)求= can 表示許可或征求對(duì)方的許可，常于第一人稱連用。 注：May I .? Yes ,you may No, you cant / mustnt . 在回答以may引起的問句時(shí)，多避免用這個(gè)詞，而用其它方式，

3、如Yes, please. / Certainly. 2）表推測，可能、也許。常用于肯定句中。 Maybe he knows the news .= He _ _ the news.,3. Must 1）表示義務(wù)。意為“必須”（主觀意志）。 We must do everything step by step. 注：Must I .? Yes, you must / No,you neednt(dont have to ). -Must we hand in our exercisebooks now? -No, you neednt. / No, you dont have to. 2）mu

4、stnt 表禁止、不允許。 You mustnt talk to her like that. 3）表示揣測。意為“想必、準(zhǔn)是、一定”等，只用于肯定句。否定、疑問句中must改為can . He must be ill. He looks so pale. Shes wearing a diamond necklace. She must have a lot of money. 注：must表推測時(shí)，其反義疑問句與must后面的動(dòng)詞一致。 There must be something wrong ,_ _?,4.need的用法 need既可用作情態(tài)動(dòng)詞，也可用作實(shí)義動(dòng)詞。用作情態(tài)動(dòng)詞時(shí)，主

5、要否定句或疑問句中。用作實(shí)義動(dòng)詞時(shí)，可用于各種句式。 1).用作情態(tài)動(dòng)詞，用于否定句和疑問句中。 a).Need I .? Yes , you must / No, you neednt . Need we finish the work today ?Yes you _? A.need B.can C. may D.must b).need + do sth . 變否定句：neednt do sth 變疑問句：Need sb do sth ?,2).用作實(shí)義動(dòng)詞 a).need + to do sth . We need _(buy) some school things . 變否定句：do

6、nt /doesnt /didnt +need to do sth . 變疑問句：Do / Does /Did sb + need to sth ? Yes , do/ does / did No, sb dont / doesnt /didnt . You dont need to do it yourself. b).當(dāng)主語是物時(shí)。Sth + need + doing sth = Sth +need to be done . The table needs painting . =The table needs _ _ _ . .,5.had better 的用法 1). had bett

7、er + 動(dòng)詞原形 = Its best to do sth . You had better _ (stay )at home . = _ _ _ stay at home . 2). Had better not +動(dòng)詞原形 We had better _(not play ) the computer games,6.must 與have to 1).一般情況下，兩者可互換。 must = have to 2).must “必須，應(yīng)該”表示說話人的主觀看法，即說話人認(rèn)為必須干某事。（內(nèi)在原因） have to “必須，不得不”強(qiáng)調(diào)客觀需要，即外界因素迫使某人不得不干某事。（外界原因） I

8、 cant stop playing the computer games . For your health ,Im afraid you _. A.can B.may C.must D.had to,二情態(tài)動(dòng)詞后跟完成式和進(jìn)行式的用法 1.情態(tài)動(dòng)詞后跟完成式，表“原本應(yīng)該干某事，而實(shí)際上沒干” I should have finished the work earlier. He isnt here. He must have missed the train. 2. 情態(tài)動(dòng)詞后跟進(jìn)行式，表示“想必正在”，“可能正在”，“應(yīng)當(dāng)正在”等意。 Its twelve oclock. They m

9、ust be having lunch. They may be discussing this problem. He cant be telling the truth. She shouldnt be working like that. Shes still so weak.,三情態(tài)動(dòng)詞的同義轉(zhuǎn)換. 1.can = be able to 2.must = have to 3.neednt = dont have to 4.need do sth = need to do sth .,1.can 用法 1）表示能力，與be able to同義，但can只用于現(xiàn)在時(shí)和過去時(shí)，be able to可用于各種時(shí)態(tài)。 2).表示允許、請(qǐng)求 用could比can 語氣更加委婉客氣，常用于could I /you .?句型中，若表示同意時(shí)，用can回答而不用could . 3）表示推測 “可能”常用于否定句或疑問句中。（cant表示一定不是，表示否定推測）肯定推測中一般用could而不用can. 2. may 用法 1）表允許，請(qǐng)求= can 表示許可或征求對(duì)方的許可，