极速快三开奖

您现在的位置:主页 > 英语写作指导 > 英语写作语法 > 文章内容

不定式作主语

作者: admin来源: 网络文章 时间: 2019-03-27

To +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

极速快三开奖(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。

极速快三开奖(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:

极速快三开奖It's kind of you to help me with my English。=You are kind to helpme with my English。

相关推荐

很多人在英语考试写作中,常常犯一些基本的语法错误,最后得不偿失,损分严重。所以,认清各种各样的语法错误,尽可能地避免少犯,对于提高作文分是有极大的帮助的。现将我们在阅卷过程中所发现...[阅读全文]

not only...but also... 表示不仅而且既又,用于连接两个性质相同的词或短语。如: Not only men but also women were chosen. 不仅仅是男的,女的也有被选中的。 We were not only hungry, but...[阅读全文]