新概念英语第二册语法训练 (12)|新要闻

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一.不定式

1.定义：具有名词、形容词及副词性质并具有时态、语态变化。

2.形式：(以do为例)

主动语态被动语态

一般时 to do to be done

进行时 to be doing

完成时 to have done to have been done

完成进行时 to have been doing

3.用法：

(1)用作主语：

To speak good English is not easy.

or: It is not easy to speak good English.

(采用形式主语 it 以避免头重脚轻)

It took me an hour to do the work.

(2)用作宾语：

She decided to take the examination.

I hope to meet him soon.

(3)宾语补足语：

They expected us to help them.

Hewants his son to study hard.

金牌重点：

不定式作宾补，如谓语动词是感官动词，使役性动词(see, hear, notice, watch, make, have, let...)，则不定式符号“to”须省略，但在被动语态中不能省。

I heard them sing in the classroom.

I made her clean the room.

The girl is heard to sing an English song.

(4)用作表语：To teach is to learn.

His job is to sell cars.

(5)用作状语，表示目的，结果。

We come to school to study English.(目的)

=in order to

I hurried to the store, only to find it closed.(结果)

(6)定语：不定式短语作定语须位于名词之后。

He asked for a piece of paper to write it on.

=to write it on the piece of paper.

The poor man has no house to live in.

=to live in the house.

Have you anything to do?

=to do anything

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