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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
2、否定回答常用needn t或don t (doesn t) have to 。如：We must obey the traffic rules.我们必须遵守交通规则。Cars mustn t 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 needn t.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，can t常常译为不可能。如：The man under the tree can t be Mr. Smi
3、th. He s 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 couldn t 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c
4、an的过去式，也可以不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
5、小上的差异。）如：Mr. Wang may know Professor Li s te lephone 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 s
6、occer on the playground with BobA can B must C could3 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 mustntB cant C neednt D may not6He be in the classroom, I think.No,he be in th
7、e classroom. I saw him go home a minute age.A can mayn t B must may not C may cant 7 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 might 9 What do you think upset mean? Im not sure. It mean sad.A may B must C should D can 10
