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师梦圆初中英语教材同步新世纪课标版八年级下册Appendix II:The Infinitive下载详情
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《Appendix II:The Infinitive》课堂教学教案教学设计(新世纪版)

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 do sth

例如:It is nice for me to have breakfast with you(nice是指have breakfast with you这件事)对于我来说,能和你一起吃早餐真好。

It is nice of you to help him with his English.(nice是指you,形容人的品质)你帮他补习英语,真是太好了。

2.作宾语

a.want,decide ,agree,afford, agree, aim, appear, ask, believe, care,claim,decide ,demand, desire, determine, expect, fail, happen, hesitate, hope, intend(有打算), learn, long(渴望), manage, offer, pretend, promise, prepare, refuse, seek, swear(发誓), undertake(承担),want, wish等动词后面跟并且只能跟不定式。如:

We agreed to start early.

She wants to be a doctor.

b.love,like ,begin,start,hate ,prefer等词后面可以接不定式。