(3)用于条件句,表示“假如,万一”,省去if,should可提至句首。 Should you be late,apologize to the teacher. 七、“情态动词+have done”的用法 1.must have done sth.;can(could) have done sth. (1)must have done sth.表示对过去已经发生的事情的有把握的推测,意思是“想必、准是、一定做了某事”,只用在肯定句中。 It must have rained last night,for the ground is wet.
(2)can(could) have done sth.表示对过去发生的动作的怀疑和不肯定,通常用在否定句和疑问句中。 He can't have forgotten it.他不可能忘记的。 2.needn't have done sth.;didn't need to do sth. (1)needn't have done sth.表示已完成不需要完成的动作。 You needn't have waken me up.I don't have to go to work today. (2)didn't need to do sth.表示没有必要做而实际上也没有做某事。 I didn't need to clean the windows.My brother did it. 3.may/might have done sth. may/might have done sth.表示对过去已发生的动作的推测,意为“也许/或许已经……”。 I'm not sure.He might have said so at the conference.
4.should have done sth. should have done sth.表示本来应该做某事而实际上未做。 You should have told him about it.
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