虚拟语气分词-完成时.pptVIP

虚拟语气一.情态动词＋不定式完成体或完成进行体 1.should/ought to+不定式完成体或完成进行体,表示本来应该做某事却没有做eg: You should/ought to have asked my permission first. You shouldn’t have been resting at that time of day. 2.must+不定式完成体或完成进行体 表示对过去事态的一种猜测（可对可错）只用于肯定句。否定句和疑问句需用can’t和can. eg: Her eyes are red. She must have been crying. You must have left your handbag in the theatre. 3.May/might/can/could+不定式完成体或不定式完成进行体,表示过去的”可能” eg: She could have missed the train. might/could+不定式完成体或不定式完成进行体,有时可以表示本来可能发生但没有发生，或者本来可能完成却没有完成的动作。 eg: You might have killed yourself. I could have passed the examination, but I failed. 4.Would+不定式完成体或不定式完成进行体 表示本来可能做某事但实际没有做，是一种假设，常与if 连用 eg: If you gave me another chance, I would have cherished it. 5. needn’t +不定式完成体或不定式完成进行体,表示“做了不必做的事”。 eg: You needn’t have been so kind. 二.用于表示命令，决定，建议等词语之后的that－分句中 (1) eg:建议某人做某事 suggest that sb./sth. (Should)+动词原形 suggest, propose, desire, request, advise, decide, command, demand, insist, require, order, recommend, beg, prefer, pray, maintain, stipulate, direct等动词后面。 eg: The police ordered that the robber (should) put down the gun. I prefer that Chen (should) play the role of Lin. 我们要求取消期末考试。 (2)用在advisable，essential，proper，appropriate，desirable，imperative，important，impossible，necessary urgent, preferable, vital, insistent, crucial, strange等形容词之后的that－分句中。 eg：It is essential that all the facts （should）be examined first. It is necessary that you do this exercise carefully. It is appropriate that you wear a suit there. (3)用在suggested, proposed, demanded, required, requested, desired, ordered, recommended, insisted, asked, resolved等分词后。 eg: It was proposed that the matter be discussed at the next meeting. (4)用在suggestion, proposal, advice, order, request, recommendation, requirement, insistence, stipulation, necessity, command名词后等。 eg: What do you think of his suggestion that we all attend the meeting? Exercises: 1.The representative of the company deman