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不定式作主語

作者: admin來源: 網絡文章 時間: 2019-03-27

To +動詞原形

Not to do

解釋:具有動詞的性質,作賓語,狀語/具有名詞的性質,作主語/具有形容詞性質,作定語/具有副詞的性質,作狀語。除謂語不可作之外,其他都可。

一般式:to do

進行時:to be doing

完成時:to have done

完成進行時:to have been doing

to do:表示動作發生在謂語之后,I want to go home.與謂語動詞幾乎同時發生

to be doing :表示與謂語動詞同時發生

to have done:發生在謂語動詞之前 Someone was considered to have done something.

to have been doing :動作從過去開始一直持續到謂語動詞這個動作的發生

(1)動詞不定式作主語時,謂語動詞常常用單數。例如:

To do morning exercises is useful for our health. 做早操有利于我們的健康。

To sweep the floor is my duty every day. 每天打掃地板是我的責任。

(2)如果動詞不定式太長,常常用it作形式主語,而將真正的主語——動詞不定式后置。例如:

It took me half an hour to walk there.我走到那兒花了半小時的時間。

It's important for us to learn English well.對我們來說,學好英語是重要的。

下面歸類五種句型:

①It+be+名詞+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+形容詞+for sb+to do

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

④It+be+形容詞+of sb+to do

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

⑤It seems(appears)+形容詞+to do

It seemed impossible to save money.

注意:

在句型③中,常用表示客觀情況的形容詞,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 表示贊揚或批評的詞。在不定式前的sb,可看作其邏輯主語。這一句式有時相當于Sb is+形容詞+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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