情态动词表推测用法小结

1、情态动词表推测用法 小结情态动词 must, can/could/may/might可以用来表示对事情进行推测。（一 ）情态动词对现在事情进行推测 情态动词 +动词原形 （do）1.must。一定用于肯定句中，表很有把握的肯定推测，译为。”Eg: Its already 12:30.Y moust be hungry now.（ 你一定饿了 .）The light is still on. He must be working in the office now.（ 他一定在办公室工作 ）2.can用于否定句或疑问句中，很有把握的否定推测，译为 “不.可能” / 可.能 . ”Eg: Jack

2、 can ' t be a policeman, for he' s much tooshort.（不可能是个警察 ）Mr Bush is on time for everything. How can it be that he was late for the opening ceremony?（他怎么可能会不准时参加开幕式呢?）3 may /might 用于肯定句中，语气不很肯定，译为 “。可能。 ” Eg: He may be in the classroom. I' ll go and make sure.-Are you come to the party?

3、 I ' m not sure. mI ight go to the concert instead.（二 ）情态动词对过去事情的推测 . 情态动词 + have done。1 must have done 一定做过。2 can ' t/couldn ' t hav -e- -d-o一ne定没做过。3 might /could have done 可能做过。Eg: I didn 't hear the pho mneu.s It have been asleep.（我一定是睡着了 .）Jack can ' t have arriveyde t; othe

4、rwise he would have telephone me.（ Jack不可能已经到了 ）Sorry I ' m latem . iIg ht have turned off the alarm clock and gone to sleep again.（可能把闹钟关闭后又睡着了 ）注意： must have done 结构中反意疑问句的用法 .句中有表过去时间的词，反意问句部分用过去时；句中无表过去时间的词，反意问句部分用完成时。1 The children must have watered the tomatoes yesterday, didn ' t they

5、?2 They must have been very tired last week, weren ' tthey ?3 The minister must have arrived in Shanghai , hasn' hte? （三）情态动词表责备语气1 should /ought to have done本应该 而没做了（表强烈的责备或遗憾的语气）We should have studied last night, but we went to the concert instead.I was really anxious about you. You shouldn'hotm hea ve leftwithout a word.2 could /might have done- 本可以做 而没做（责备或遗憾的语气比 should /ought to have done 弱）He might have given you more help, even though he was very busy.3 need