英语中不定式作主语

英语中不定式作主语
英语中不定式作主语

英语中不定式作主语

o +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 doing

to 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 done 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。

It's important 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:

①It+be+名词+to do

It's our duty to take good care of the old.

②It takes sb+some time+to do

How long did it take you to finish the work?

③It+be+形容词+for sb+to do

It is difficult for us to finish writing the composition in a quarter of an hour.

④It+be+形容词+of sb+to do

It is stupid of you to write down everything (that) the teacher says.

⑤It seems(appears)+形容词+to do

It seemed impossible to save money.

注意:

在句型③中,常用表示客观情况的形容词,如:

difficult,easy,hard,important,impossible,necessary 等;在句型④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:

It's kind of you to help me with my English.=You are kind to helpme with my English.

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★教某人做某事teach sb. to do sth ★想要某人做某事want /would like sb.to do sth. ★同意某人做某事agree sb. to do sth.. ★喜欢/想要某人做某事like sb. to do sth. ★帮助某人做某事help sb. to do sth/help sb.do ★It’s one’s turn to do sth. 轮到某人做某 事 ★It’s time(for sb.) to do sth.是某人做某事时候了 ★It’s +adj. for/of sb. to do sth. 对于某人来说做某事是…… ★It takes sb. time to do sth. 某人做某事花了某时间

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英语中的动词不定式

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It's very kind / nice of you to help me。感谢你的帮助。 当表语形容词说明不定式具有某种特征时,应使用 "It's ...for sb. to do sth."。例如: It's hard for the Chinese students to learn Russian. 中国学生学俄语是很难的。 [高考题例] 1. Is ________ necessary to complete the design before National Day A. this B. that C. it D. he 2. It was foolish ________ you to give up what you rightly owned. A. for B. of C. about D. from II. 不定式作宾语 1. 学习不定式作宾语时,要注意掌握四种动词: 1) 后接不定式作宾语的动词。常见动词有: offer, decide, hope, promise, agree, plan, manage, refuse, wish, pretend, learn, want等。 2) 后接V-ing形式作宾语的动词。常见动词有: enjoy, mind, suggest, advise, finish, practise, imagine, admit, avoid, delay等。

初中英语动词不定式整理

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(完整版)语法精讲:be+动词不定式(用法9种)

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Where did you go yesterday? 2. 表示在过去一段时间内,经常性或习惯性的动作。 When I was a child, I often played football in the street. 三、一般将来时的用法: 1. “will\shall+动词原形”,表示单纯的将来。 时间状语有tomorrow, next month, in 2020. I will help you carry it. 2.“be going to+动词原形”,表示按照计划、安排打算做某事或有迹象要发生的事。 ①计划,安排要发生的事。 They are going to have sports meeting next month. ②有迹象要发生的事 Look at the dark clouds,there is going to be a storm. 四、现在进行时的用法: 1. “am / is / are+动词-ing”用来表示现在正在发生或进行的动作。时间状语有now, these days, these weeks等。 She is drawing a map. 她在画一张地图。 2.句首有Look ! / Listen !等提示语时,后面的句子中动词一般用现在进行时。 Look ! She is reading under the tree.瞧!她正在树下看书。 3.现在进行时有时可表示将来发生的动作,有"意图"或"打算"的含义(用于go,come,stay,1eave,start等表示移动的动词)。 He is corning to see you tomorrow.他明天要来看你。 They are going to the Ming tombs this coming Sunday. 这个星期天他们要到十三陵去。

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