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高考网汇集整理《高二英语语法知识点：不定式的用法》 动词不定式具有名词、形容词和副词的特征。因此在句中可以做主语、表语、宾语、宾语补足语、定语和状语。 一、不定式做主语： 1、不定式做主语一般表示具体的某次动作。===动名词doing 表示习惯的，经常的动作。 e.g: To finish the building in a month is difficult. To do such things is foolish. To see is to believe. (对等) 注: 1). 不定式作主语时,谓语用单数 2). 当主语较长，谓语较短时，常用it做形式主语，而将不定式放到谓语的后面。 it做形式主语，不定式放在谓语动词之后常用于下列结构中： (1)It is/was +adj.+of sb. to do… (2) It is +adj.+for sb.+to do… It is easy / difficult / hard / foolish / unwise / right / wrong / unnecessary (3) it is +a +名词+ to do... It is a pity / a pleasure / a pleasant thing / one’s duty / an honor / a shame / a crime / no easy job… to do It takes (sb.) some time / courage / patience …to do… It requires courage / patience / hard work… to do… *注意: probable 和 possible 均可作表语，但possible可以用不定式作真实主语， 而probable不能用不定式作真实主语。 It is probable for him to come to the meeting.(错） It is possible for him to come to the meeting. It is possible / probable that he will come to the meeting. (责任编辑：admin) |