出国留学首选一诺留学

　　1、一般过去时的时间标志我们都能看出来，比如in+时间，yesterday，last year，originally, from 1978 to 1985,previously等。当我们看到这些表示过去的时间标志词，就要注意这个句子的时态是否正确，是不是用的过去式。

　　2、现在完成时的时间标志有since; within/during/over/in+the past/last/recent+时间短语。表现形式是=主语+have/has +V-ed，表示动作发生在过去持续到现在。或者动作已经结束但是对现在造成了一定的影响，影响仍然与现在时刻相关.

　　3、过去完成时的表现形式是=主语+had+V-ed。表示动作发生在“过去的过去”，强调先后顺序。或者两个行为发生在过去的不同时间。这种时候就需要用过去完成时，要注意过去完成时的发生是有两个动作的先后，表示过去的过去。

　　真题1：

　　Galileo did not invent the telescope, but on hearing, in 1609, that such an optical instrument had been made, he quickly built his own device from an organ pipe and spectacle lenses.

　　A. Galileo did not invent the telescope, but on hearing, in 1609, that such an optical instrument had been made, he

　　B. Galileo had not invented the telescope, but when he heard, in 1609, of such an optical instrument having been made,

　　C. Galileo, even though he had not invented the telescope, on hearing, in1609, that such an optical instrument had been made, he

　　D. Even though Galileo did not invent the telescope, on hearing, in 1609, that such an optical instrument had been made,

　　E. Even though Galileo did not invent the telescope, but when he heard, 1609, of such an optical instrument being made, he

　　翻译：

　　G并没有发现望远镜，但是当听说1609年，光学仪器被制作后，他很快从两个东西建立了自己的仪器。

　　句式：

　　Galileo did not invent the telescope, but… he built his own device…

　　思路：

　　时态语态的问题

　　选项：

　　A. 正确;伽利略没有发明望远镜是个事实，所以本句的第一个动词invent，适用一般过去时;

　　B. 过去完成时态错误;but引导的句子缺少主语，句子结构不完整;

　　C. 过去完成时态错误;Galileo和he在此句中同时作主语，句子结构错误;

　　D. 主句缺少主语，选项最后应补上he;

　　Being made现在分词表示动作正在进行，与句子原意不符。

　　真题2：

　　For many people, household labor remains demanding even if able to afford household appliances their grandparents would find a miracle.

　　A. even if able to afford household appliances their grandparents would find a miracle

　　B. despite being able to afford household appliances their grandparents would find a miracle

　　C. even if they can afford household appliances their grandparents would have found miraculous

　　D. although they could afford household appliances their grandparents would find miraculous

　　E. even if they are able to afford household appliances which would have been a miracle to their grandparents

　　翻译：

　　对于很多人来说，家务劳动依然很费力，即使他们能买得起那些他们的祖父母会觉得像奇迹似的家务电器。

　　句式：

　　For many people..., household labor remains demanding even if they can afford appliances their grandparents would have found miracle;

　　思路：

　　时态语态的不同，还有连词意思的不同。

　　选项：

　　A. Able to前面缺少主语;而且时态不一样;应该改成WOULD HAVE DONE;WOULD HAVE FOUND清楚的表达了：如果AFFORD HOUSHOLD APPLICATIONS 发生在their grandparents那时候，那爷爷奶奶们会有的反应

　　B. Able to前面缺少主语;而且时态不一样;应该改成WOULD HAVE DONE;WOULD HAVE FOUND清楚的表达了：如果AFFORD HOUSHOLD APPLICATIONS 发生在their grandparents那时候，那爷爷奶奶们会有的反应

　　C. 正确;

　　D. even if表达的是让步，意思是“即使能付得起。。。”，正确地表达了其实不是每个人都能付得起(好比说象我这么穷的美国人);although表达的是转折。意思是“尽管能付得起。。。”，言外之意是每个人都能付得起，这个好象不对吧;

　　E. E没有错误，但是表意比C要复杂很多。

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