I. 情态动词基本用法: 情态动词 用法 否定式 疑问式与简答 can 能力 允许或许可 可能性(表猜测.用于否定句或疑问句中) can not / cannot /can’t do Can-do-? Yes,-can. No,-can’t. could couldn’t do may 可以 可能.或许 祝愿 may not do May-do-? Yes,-may. No,-mustn’t/can’t. might might not do Might-do-? Yes,-might No,-might not. must 必须.应该 肯定.想必 must not/mustn’t do Must-do-? Yes,-must. No,-needn’t/don’t have to. have to 只好.不得不(客观的必须.有时态人称变化) don’t have to do Do-have to do-? Yes,-do. No,-don’t. ought to 应当(表示义务责任.口语中多用should ought not to/oughtn’t to do Ought-to do-? Yes,-ought. No,-oughtn’t. shall 将要.会 用于一三人称征求对方意见 用于二三人称表示许诺.命令.警告.威胁等 shall not/shan’t do Shall-do-? Yes,-shall. No,-shan’t. should 应当.应该 本该 should not/shouldn’t do Should-do-? will 意愿.决心 请求.建议.用在问句中would比较委婉 will not/won’t do Will-do-? Yes,-will. No,-won’t. would would not/wouldn’t do dare 敢(常用于否定句和疑问句中) dare not/daren’t do Dare-do-? Yes,-dare. No,-daren’t. need 需要 必须(常用于否定句和疑问句中) need not/needn’t do Need-do-? Yes,-must. No,-needn’t. used to 过去常常 used not/usedn’t/usen’t to do didn’t use to do Used-to do-? Yes,-used. No,-use(d)n’t. Did-use to do-? Yes,-did. No,-didn’t. II. 情态动词must, may, might, could, can表示推测: 以must为例.must + do(be)是推测现在存在的一般状态进行,must + be doing 推测可能正在进行的事情,must +have done是推测可能已经发生过的事情. 【查看更多】
