大学虚拟语气课件[精选].ppt

c)用在decision，decree，demand，order等名词之后的that-分句中。例如： We were face with the demand that this tax be abolished.在这一用法中be-型虚拟式能与“should+不定式“交替使用，也能与to-不定式交替使用。例如： He ordered that the books be sent at once.=He ordered that books should be sent at once.  2.用于由if, though等引导句的分句中 型虚拟式be-能用于if，though，whatever，lest等引导的分句中表示推测、让步、防备等含义。例如： If he be found guilty, John shall have the right of appeal. 非正式语体中通常用动词陈述式或者用should/may+不定式。例如： If the rumour is true, everything is possible. I shall send him a written word, lest he should forget. 3.用于某些公式化语句中 be-型虚拟式用于某些公式化语句中可表示祝愿、诅咒、禁止等意义。例如： Long live the People’s Republic China! God damn you! Were-型虚拟式 1.用于某些状语从句中 Were-型虚拟式常用于由if, if only, as if, as though, though引导的条件状语和让步状语从句中，表示非真实的条件和让步。 If I were you, I won’t do that again. If only I were not so nervous. He spokes to me as if I were deaf. He behaves as though he were better than us. Though the whole world were against me, I would do what I consider as right. 2.用于某些名词性分句中 a) Were-型虚拟式常用于wish之后的that-分句中，表示一种臆想的情况。 I wish I were a bit taller. I wish I knew the answer to the question. 注意：I wish和I hope都表示“希望”，但I hope that…并不表示假设意义，随后的动词形式除表示婉转口气外，很少用过去时形式。 I hope you are ready. I hope the weather would be favorable. I hope you can do something to help her. b)用于would rather, would sooner, would just as soon后的宾语从句。 I would rather you went there alone. I would sooner she came here the day after tomorrow. I would just as soon he solved the problem all by himself. c) 用于if only引导的虚拟条件从句 If only I were you. 要是我是你就好了。 d) 用于在“It’s (high , about) time that…”句型中 It’s time (that) we went home. It’s high time you lent her a hand. 用于suppose, supposing, imagine等后面的宾语从句 在这个句型中，谓语动词用一般过去时，表示一种假设。 Supposing the earth were flat, what would happen in the ship sailing round the earth? Imagine everyone were to give up smoking. Suppose you had one million pounds, w