动词不定式用法 动词不定式没有人称和数的变化,在句中不能独立作谓语。但动词不定式具有名词、形容词和副词特征,在句中可以作主语、宾语、宾语补足语、定语、表语和状语等多种成分。另外,动词不定式具有动词特点,可以有自己的宾语和状语,组成动词不定式短语。动词不定式的肯定形式是 to+do;其否定形式是 not to+do。 下面以动词不定式在句中的作用来予以详细说明。 1 .作主语 可以直接作主语。如: To see is to believe. 但在英语中,常用it 作形式主语,真正的主语即动词不定式放在后面。如: It's wrong to play tricks on other people. It's our duty to keep our environment clean and tidy. 点击规律:动词不定式在句中作主语时,常放在It is +adj +(for sb.)+(not)to do sth 句型中,表示说话人对客观事件的决断,意为:做…..是……的,it 仅作形式主语,真正的主语是 to do sth It is very interesting to read.读书是有趣的 It is useful to read.看书是有用的 It is healthy to run every day.每天跑步是健康的 It is a little difficulty for me to work out this question.解出这道题对我来说有点难 It is bad not to finish homework.不完成作业是糟糕的 It is bad to be late for school.迟到是糟糕的 It is+adj+of sb +(not)to do sth 该句型通常表示说话人对客观事件的惊讶、兴奋、懊悔、难过等感叹情绪,与 It is +adj +(for sb.)+(not)to do sth 的意义不同。 It is very kind of you to tell me the truth.你能告诉我事实,真是太好了 It is stupid of him to do such a silly thing. 他做那件傻事,真是太笨了 It is very clever of you to work out this question. 你能解出这道题目,真是太聪明了 It is very wise of you to read this novel. 你看这本小说,真是太明智了 这个句型中用介词of 而不是 for 的原因是这里的形容词是用来形容人的品质性格的。 类似的词有:careless,careful,clever,considerate,foolish,good,impolite,kind, naughty,nice,silly,stupid,friendly 因此区分是用It is +adj +(for sb.)+(not)to do sth 还是 It is+adj+of sb +(not)to do sth,要清楚adj 修饰的是sb 还是to d...