《情态动词的用法很多.doc》由会员分享，可在线阅读，更多相关《情态动词的用法很多.doc（2页珍藏版）》请在三一文库上搜索。
1、情态动词的用法很多，初中英语中表示推测的情态动词主要有: must，can/could，may/might等。1. must多用于肯定句中表示把握性极大的推测，意思为一定、肯定。如:You have worked hard all day. You must be tired. 你已辛苦工作一整天了，一定累了。The book must be his. His name is on the cover. 这本书一定是他的，封面上写着他的名字。【注意】must下面的用法与表推测时的区别。must不表推测时，在肯定句中意思为必须(强调内在的职责)，在否定句中意思为不许、禁止，以它开头的疑问句否定回
2、答常用neednt或dont (doesnt) have to。如:We must obey the traffic rules. 我们必须遵守交通规则。Cars mustnt be parked here. 此处严禁停车。Must I hand in my homework now? 我现在必须交家庭作业吗?No，you neednt. 不，你不必。2. can/could多用于否定句、疑问句或感叹句中表示推测、怀疑，两者在时间上没有差别。用can时不相信的程度更强一些， cant常常译为不可能。如:The man under the tree cant be Mr. Smith. Hes
3、gone to England.树下那个人不可能是史密斯先生，他已经去英国了。Can it be true that he was fooled by a five-year-old boy?他被一个五岁的孩子愚弄了，这能是真的吗?【注意】can/could下面的用法与表推测时的区别。can/could不表推测时的用法有:表示能力，could为can的过去式。如:Jack can speak five languages.杰克能讲五种语言。I couldnt hear what they were saying.我听不见他们在说些什么。表示允许或请求， could可以是can的过去式，也可以不
4、表示过去而表示一种委婉的语气。如:You can go with them if you like.如果你愿意的话，可以和他们一块去。He said I could keep the book for a week.他说这本书我可以借阅一周。Can/could I use your bike?我可以用一下你的自行车吗?表示客观可能性。如:Anybody can make mistakes.3. may/might多用来表示把握性不大的推测，意思为也许、可能，might比may的把握性更小一些。may not在否定句中常常译为可能不。(注意区分不可能与可能不在把握性大小上的差异。)如:Mr. W
5、ang may know Professor Lis telephone number.王先生也许知道李教授的电话号码。This might be the key Tom has been looking for.这可能就是汤姆一直在找的钥匙。She may not be there today.今天她可能不在那儿。练习 John_come to see us tonight,but he is not very sure yetA may B need C cant D must2 John isnt in the classroom .He _play soccer on the play
6、ground with BobA can B must C could 3 That _not be her husband.A may B can C could D might4 You _go and see a doctor at once because you got a fever.A can B must C dare D would5 Can you speak Japanese? No,_A mustnt B cant C neednt D may not6He _be in the classroom, I think.No,he _be in the classroom
7、. I saw him go home a minute age.A can maynt B must may not C may cant7 I s Tom swimming in the pool?No, she _swim.She is terrified of water.A may not B must not C can not D need not 8 He isnt at school. I think he _be illA can B must C shall D might9 What do you think “upset” mean?Im not sure. It_mean sad.A may B must C should D can10