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1、文档来源于网络，如有重复请自行下载不定式作主语To +动词原形Not to do解释：具有动词的性质，作宾语，状语/具有名词的性质，作主语/具有形容词性质，作定语/具有副词的性质，作状语。除谓语不可作之外，其他都可。一般式：to do进行时：to be doing完成时：to have done完成进行时：to have been doingto do:表示动作发生在谓语之后，I want to go home.与谓语动词几乎同时发生to be doing :表示与谓语动词同时发生to have done:发生在谓语动词之前 Someone was considered to have don
2、e something.to have been doing :动作从过去开始一直持续到谓语动词这个动作的发生（1）动词不定式作主语时，谓语动词常常用单数。例如：To do morning exercises is useful for our health. 做早操有利于我们的健康。To sweep the floor is my duty every day. 每天打扫地板是我的责任。（2）如果动词不定式太长，常常用it作形式主语，而将真正的主语动词不定式后置。例如：It took me half an hour to walk there我走到那儿花了半小时的时间。Its importa
3、nt for us to learn English well对我们来说，学好英语是重要的。下面归类五种句型：It+be+名词+to doIts our duty to take good care of the old.It takes sb+some time+to doHow long did it take you to finish the work?It+be+形容词+for sb+to doIt is difficult for us to finish writing the composition in a quarter of an hour.It+be+形容词+of sb
4、+to doIt is stupid of you to write down everything (that) the teacher says.It seems(appears)+形容词+to doIt seemed impossible to save money.注意：在句型中，常用表示客观情况的形容词，如：difficult,easy,hard,important,impossible,necessary 等；在句型中，常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise等 表示赞扬或批评的词。在不定式前的sb，可看作其逻辑主语。这一句式有时相当于Sb is+形容词+to do句式。如：Its kind of you to help me with my English.=You are kind to helpme with my English.3
