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1、精品学习资源中考考点十：情态动词一情态动词的用法1. can 用法1）表示才能，与 be able to 同义，但 can 只用于现在时和过去时， be able to可用于各种时态；Two eyes can see more than one.注： Can you . Yes, I can / No,I cant.2.表示答应、恳求用 could 比 can 语气更加委婉客气，常用于could I /you .句型中，如表示同意时，用can回答而不用 could .Could I borrow the book . No, you can t .3）；表示估计 “可能”常用于否定句或疑问句中
2、；（ can表t示肯定不是）It can t be true . Can it be true .2. may 用法1）表答应，恳求 = can表示许可或征求对方的许可，常于第一人称连用；注： May I. Yes ,you mayNo, you cant / mustnt . 在回答以 may 引起的问句时，多防止用这个词，而用其它方式，如Yes, please. / Certainly.2）表估计，可能、或许；常用于确定句中；欢迎下载精品学习资源Maybe he knows the news .= He the news.3. must1） 表示义务；意为 “必需”（主观意志）；We mu
3、st do everything step by step.欢迎下载精品学习资源注： Must I. Yes, you must / No,you needntvdeotno .-Must we hand in our exercise books now.-No, you needn t. / No, you don t have to.t ha欢迎下载精品学习资源2） mustn表t 禁止、不答应；You mustn t talk to her like that.3） 表示揣测；意为 “想必、准是、肯定 ”等，只用于确定句；否定、疑问句中 must改为 can .He must be i
4、ll. He looks so pale.She s wearing a diamond necklace. She muasvt eh a lot of money. 注： must 表估计时，其反义疑问句与 must 后面的动词一样；There must be something wrong , .4. need的用法need 既可用作情态动词，也可用作实义动词；用作情态动词时，主要否定句或疑问句中；用作实义动词时，可用于各种句式；1). 用作情态动词，用于否定句和疑问句中；a.Need I . Yes , you must / No, you needn t . Need we fini
5、sh the work today .Yes you.欢迎下载精品学习资源A.need B.can C. may D.mustb.need + do sth .变否定句： needn t do sth变疑问句： Need sb do sth .2). 用作实义动词a.need + to do sth .We needbuy some school things .变否定句： don t /doesn t /didn t +need to do sth .变疑问句： Do / Does /Did sb + need to sth .Yes , do/ does / did No, sb don
6、t / doesn t /didn t .You don t need to do it yourself.b.当主语是物时； Sth + need + doing sth = Sth +need to be done . The table needs painting .=The table needs .5. had better的用法1). had better +动词原形 = Itessbt to do sth .You had betterstay at home . = stay at home .2). Had better not +动词原形We had betternot
7、play the computer games .6. must与 have to1.一般情形下，两者可互换； must = have to2.must “必需，应当 ”表示说话人的主观看法，即说话人认为必需干某事；（内在缘由）have to “必需，不得不 ”强调客观需要，即外界因素迫使某人不得欢迎下载精品学习资源不干某事；（外界缘由）I can t stop playing the computer games . For your health ,I m af you.A.canB.mayC.mustD.had to二情态动词后跟完成式和进行式的用法1. 情态动词后跟完成式，表 “原本应
8、当干某事，而实际上没干 ”I should have finished the work earlier.He isn t here. He must have missed the train.2. 情态动词后跟进行式，表示 “想必正在 ”，“可能正在 ”，“应当正在”等意；It s twelve o clock. They must be having lunch. They may be discussing this problem.He can t bteelling the truth.欢迎下载精品学习资源She shouldn t be working like that. Sheak.s still so we欢迎下载精品学习资源三情态动词的同义转换 . 1.can = be able to2.must = have to 3.needn t = donhavetto4.need do sth = need to do sth .欢迎下载精品学习资源欢迎下载