如何运用must、might、could、can'

1个回答

can could 1能力 ex:I can sing.2 客观可能性 ex:Man can’t live without water.Anybody can make mistake.3请求和许可 ex:Can I go now?4表示推测,惊讶,怀疑,不相信等态度（主要用语否定、疑问或感叹句中）.ex:He can’t be over 60.may / might 1请求许可=can /could ex:May I use your pen?2可能性 (可能发生的动作或者状态) ex:He may know about it.3祝愿 ex:May God bless you.4 may/might as well do sth 不妨….ex:We may/might as well try.5 might 表推测时,不表示时态,只表示可能性比may 小.must 1义务 ex:We must help her.2 推测 ex:You must be tired/ a student/ working at this time .3必然性 ex:We must die.人总是要死的.4偏偏,偏要,非得干.不可,一定要（表说话人不耐烦//讽刺//热情） ex:Why must you always be finding fault with that girl?你干吗非要找那个女孩子的错呢.can't 1拒绝 ex:You can't go 2否定的推测 ex:He can't have done that.3同“can could”的第四点 mustn't 1禁止 ex:You mustn't get into that building.2一定没有 ex:He mustn't have done that.