高二英语知识点不定式用法
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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.
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