高中英语情态动词详解及练习（无答案）

高中英语情态动词详解 1. 表示请求和允许: can, could , may,  might. 过去式使语气更委婉，答语应用原形。           --- Could I use your computer tomorrow morning? --- Yes, you can.( 否定回答可用：No, I’m afraid not.) 2．表示推测： 理论可能性 can   可能性 肯定句 must, may ,might, could 疑问句 can 否定句 can’t (不可能)，may not (可能不) 1)can表示理论上的可能性，指某事或情况可能发生，但并不说明实际上真的发生.          Children can be very tiring.  2)对现在事情的推测：  情态动词+do 对过去事情的推测：  情态动词+have done 对已完成事情的推测：情态动词+have done 3)反意问句：  He may know the plan, doesn’t he? You must have studied English before, haven’t you? You can’ t have been caught in the rain last night, were you? 3．can & be able to  在肯定句中can表示有“能力”做，be able to表示通过想办法/努力等而能够做成了某一件事， 相当于managed to do…或succeeded in doing sth.   Birds can fly. The fire spread through the hotel very quickly but everyone was able to get out. 4. may / might as well do sth  “还是…好”、“不妨” You might as well tell me the truth. 你还是把真相告诉我的好。 5. must和have to    1) must表示的是说话人的主观看法, 而have to强调客观需要。 2）否定形式含义不同。mustn’t禁止，不许可，don’t have to不必 3) must 偏要（做令人不快的事