Grammar Structures for Unit 1 Book IIIModal verbs （情态动词）教 师 寄 语 ：Just put one foot in front of the other and God will do the rest.may / might, can / could, will / would, shall / should, must / can 的用法。1.may 与might 的用法情态动词用法例句may与might表示允许、许可。否定答语一般 要 用 mustn’t， 表 示 “ 禁止、阻止”之意。--- May I watch TV after supper?--- Yes, you may. / No, you mustn’t.在表示请求、允许时, might 比 may 的语气更委婉一些。在日常口语中，用can 征询对方意见更为常见。---Might I use your telephone?--- Yes, please.--- May / Can I go home now?--- Yes, you may / can.表示可能性的推测，含有“或许”“大概”“可能”之意，用might 代替may 时，则语气显得更加不肯定。What he said may be true.She may come tomorrow.He might have some fever.2. can 与could 的用法情态动词用法例句 can与could表示能力Some of us can use the computer now, but we couldn’t last year.表示客观的可能性It will be sunny in the daytime, but it could rain later on this evening.表示请求和允许--- Can I go now?--- Yes, you can. 表示请求,口语中常用could代替can, 使语气更加婉转Could you wait a few day for the money?Could you please show me the way to the station?表示惊异、怀疑、不相信的态度（主要用于否定句、疑问句和惊叹句中）Can this news be true?It can’t be the headmaster. He’s gone to Beijing.How can you be so foolish!用心 爱心 专心3. will 与would 的用法情态动词用法例句 will与would用于表示意志或意愿。Will 指现在，would 指过去I will never do that again.They said that they would help us. 表示请求、建议等，用would比用 will 委婉、客气些Will you please take a message for me?Would you please pass him the book?表 示 习 惯 性 动 作 ， 译 为 “ 总是 ” “ 惯 于 ” 。 Will 指 现在，would 指过去Fish will die without water.Every evening, she would sit by the windo...
