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1、it作形式宾语：it作形式宾语时，可以代替三种形式：不定式、动名词和宾语从句。it作形式宾语时，需具备两个条件： 真正的宾语是不定式、动名词或从句； 有宾语补足语具备了这两个条件，形式宾语it一定要用。 it代替不定式短语think/ find/ feel/ consider/ make/ regard+ it +形容词/名词 + 不定式短语，如：I find it pleasant to work with him.(it 作形式宾语，代替不定式短语to work with him)我觉得和他一起工作很愉快。They felt it difficult to finish the work
2、in such a short time.（ it 作形式宾语，代替不定式短语to finish the work in such a short time）他们认为在这么短的时间内完成这项工作是困难的。She thinks it her duty to help us.（ it 作形式宾语，代替不定式短语to help us）她觉得帮助我们是她的责任。 I think it my honor to be invited to speak here.（ it 作形式宾语，代替不定式短语to be invited to speak here）我觉得应邀在这儿演讲是我的荣耀。Tom didnt f
3、ind it difficult to write letters in Chinese.（ it 作形式宾语，代替不定式短语to write letters in Chinese）汤姆发现用汉语写信不难。All these noises made it impossible for me to go on with the work.（ it 作形式宾语，代替不定式短语to go on with the work）这些噪音使我无法继续工作。 it代替动名词短语( 这只限于少数句型，在多数情况下用不定式时更多一些)，如：The professor considers it no good re
4、ading without understanding.这位教授认为阅读而不理解没有益处。Do you consider it any good trying again? 你觉得再试会有好处吗？He found it useless( no use) arguing with him. 他发现和他辩论没有用。He thought it absolutely senseless attempting the impossible.想做不可能的事情，他认为是完全没道理的。 I dont think it worthwhile going to such a place.到这样一个地方去我看是不值得的。 it代替宾语从句：如：We all thought it a pity that the conference should have been cancelled.会议取消了我们都感到很遗憾。I took it for granted that they were not coming.我想他们准是不会来的了。Ill see to it that everything is ready in time.我负责使一切都按时准备好。