摘要:2.用it作形式主语 在很多情况下.人们通常用it作为形式上的主语.而把不定式移到谓语之后.使句子结构显得平稳一些. It's rude to turn your back to your teacher and refuse to answer. 背对着老师.拒绝回答问题是不礼貌的. It is impossible to learn a foreign language without making painstaking effort. 想不下苦功就能学会外语是不可能的. It seemed a pity to have wasted so much time. 浪费了这么多时间.真是遗憾. 注意: 当主语和表语都是不定式时.不能用形式主语代替动词不定式. To respect others is to be respected. 尊重别人就是尊重自己. To become a slave is to give up one's freedom. 做奴隶就等于放弃自由. B. 动词不定式作表语 不定式作表语可以说明主语的具体内容或表示目的. His wish is to become an astronaut. 他的愿望是成为一名宇航员. What he hoped was to be admitted into the university. 他希望能被大学录取. To live is to do something worthwhile. 活着就是要做一些有价值的事情. 注意: 有些作表语的不定式.在结构上是主动的.但在意义上却是被动的. She is to blame. 她应该受到责备. The house is to let. 此房出租. The result is not long to see. 结果不久就会看到. C. 动词不定式作宾语 不定式可以充当部分及物动词的宾语.也可以充当but和except等介词的宾语以及形容词的宾语.

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