could/should/must/.加have done和have been done区别
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could/should/must/.加have done和have been done区别
情态动词+ have +过去分词
1) may(might) have + done sth, can (could) have + done sth 表示过去,推测过去时间里可能发生的事情.
Philip may (might) have been hurt seriously in the car accident.
Philip can (could) have been hurt seriously in the car accident.
2) must have +done sth,对过去时间里可能发生的事情的推测,语气较强,具有"肯定","谅必"的意思.
---Linda has gone to work, but her bicycle is still here.
---She must have gone by bus.
3) ought to have done sth, should have done sth
本应该做某事,而事实上并没有做.否定句表示"不该做某事而做了".
You ought to (should) have been more careful in this experiment.
He ought not to have thrown the old clothes away.(事实上已扔了.)
ought to 在语气上比should 要强.
而后面跟have been done 表示:本来能,本来应该,本来必须.
1) may(might) have + done sth, can (could) have + done sth 表示过去,推测过去时间里可能发生的事情.
Philip may (might) have been hurt seriously in the car accident.
Philip can (could) have been hurt seriously in the car accident.
2) must have +done sth,对过去时间里可能发生的事情的推测,语气较强,具有"肯定","谅必"的意思.
---Linda has gone to work, but her bicycle is still here.
---She must have gone by bus.
3) ought to have done sth, should have done sth
本应该做某事,而事实上并没有做.否定句表示"不该做某事而做了".
You ought to (should) have been more careful in this experiment.
He ought not to have thrown the old clothes away.(事实上已扔了.)
ought to 在语气上比should 要强.
而后面跟have been done 表示:本来能,本来应该,本来必须.
could/should/must/.加have done和have been done区别
should have done和could have done的区别?
could have done和should have done
would/could//should/must have done
should/could/must/might have done用法?
should have done与should have been done的区别?
must have been done must have done
MUST have been done
英语:should have done与could have done区别?
need have done ,must have done ,can/could have done ,should
can be done was done could be done must have been done will
区别could,might,would,should have done