作业帮什么是过去完成时_过去完成时的用法
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什么是过去完成时_过去完成时的用法
什么是过去完成时_过去完成时的用法
什么是过去完成时_过去完成时的用法
什么是过去完成时?过去完成时是一种相对时态,即以某一过去吋间作参照,过去完成时表示的动作发生在这一过去时间之前,所以我们可以简单地用"过去的过去"这五个字来理解过去完成吋态.如：1.He______more than 5000 English words when he entered the university at the age of 15.A.has learned B.would have learned C.learned D.had learned 【分析】答案选D.因为上大学是过去,学了五千个英语单词是在上大学之前,即"过去的过去",所以用过去完成吋.【注】用于某些特殊句型：no sooner''''''than ,hardly''''''when ,scarcely''''''before等.如：We had no sooner set out than a thunderstorm broke.我们刚出发就遇到了大雷雨.（主句谓语要用过去完成时） He had hai'dly arrived when it began to snow.他一到,天就下起雪来了 .（主句谓语要用过去完成时） Scarcely had I arrived at the station before the train left.我剛抵达车站,火车就走了 .（主句谓语要用过去完成时） 2.When the old man______to walk back to his house ,the sun______itself behind the mountain.A.started;had already hidden B.had started ；had already hidden C.had started；was hiding D.was starting ；hid 【分析】答案选A.根据句意,"开始回房子"发生在过去,"太阳落山"是在"开始回房子"之前,故过去的过去.3.Father______for London on business upon my arrival,so I didn't see him.A.has left B.left C.was leaving D.had left 【分析】答案选D.根据"我没见到他"可知,"在我到达"前"父亲已经去伦敦"了,即父亲去伦敦发生在"过去的过去",故用过去完成时.4.The policeman 's attention was suddenly caught by a small box which______placed under the Minister 's car.A.has been B.was being C.had been D.would be 【分析】答案选C.因为这个小盒子"被放在部长车下"发生在"引起警察注意"之前,即"过去的过去",所以用过去完成时.5." Hurry up !Alice and Sue are waiting for you at the school gate." " Oh !I______thought they without me." A.wen B.are going C.have gone D.had gone 【分析】答案选D.