英语中的 动词不定式 是什么意思?

不定式是英语动词的一种形式。它在许多情况下可省略"to"它不同于汉语动词，汉语动词只有一种形式。如：我看书。她看书。但英语要说“看”必须根据主语的人称，动作发生的时间等确定其形式。如：1）I read a book. 2）She reads a book.1）句中的“read”
是一般现在时第一人称的动词定式。2）句中的“reads”是一般现在时第三人称单数的动词定式。
I want to read a book./She wants to read a book.
我想要看书。她想要看书。其中的“看”不易确定其形式。因为动作还未发生，因此称不定式。通俗的说，就是“不一定是什么形式”

动词不定式
英语语法--动词不定式

动词不定式

7.1 不定式作宾语

1) 动词+ 不定式

afford aim appear agree arrange ask be decide bother care choose come dare demand desire determine expect elect endeavor hope fail happen help hesitate learn long mean manage offer ought plan prepare pretend promise refuse seem tend wait wish undertake

举例：

The driver failed to see the other car in time.

司机没能及时看见另一辆车。

I happen to know the answer to your question.

我碰巧知道你那道问题的答案。

2）动词+不定式 ； 动词+宾语+不定式

ask, beg, choose, expect , hate, help intend like, love, need prefer, prepare, promise, want, wish…

I like to keep everything tidy. 我喜欢每件东西都保持整洁。

I like you to keep everything tidy. 我喜欢你年使每件东西都保持整洁。

I want to speak to Tom. 我想和汤姆谈话。

I want you to speak to Tom. 我想让你和汤姆谈话。

3） 动词+疑问词+ to

decide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tell

Please show us how to do that. 请演示给我们如何去做。

There are so many kinds of tape-recorders on sale that I can’t make up my mind which to buy.有这么多的录音机，我都拿不定主意买哪一种。

注意:疑问词带不定式在句中作成分时，谓语动词用单数。

The question is how to put it into practice.

问题是怎样把它付诸实施。

7.1 不定式作宾语

1) 动词+ 不定式

afford aim appear agree arrange ask be decide bother care choose come dare demand desire determine expect elect endeavor hope fail happen help hesitate learn long mean manage offer ought plan prepare pretend promise refuse seem tend wait wish undertake

举例：

The driver failed to see the other car in time.

司机没能及时看见另一辆车。

I happen to know the answer to your question.

我碰巧知道你那道问题的答案。

2）动词+不定式 ； 动词+宾语+不定式

ask, beg, choose, expect , hate, help intend like, love, need prefer, prepare, promise, want, wish…

I like to keep everything tidy. 我喜欢每件东西都保持整洁。

I like you to keep everything tidy. 我喜欢你年使每件东西都保持整洁。

I want to speak to Tom. 我想和汤姆谈话。

I want you to speak to Tom. 我想让你和汤姆谈话。

3） 动词+疑问词+ to

decide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tell

Please show us how to do that. 请演示给我们如何去做。

There are so many kinds of tape-recorders on sale that I can’t make up my mind which to buy.有这么多的录音机，我都拿不定主意买哪一种。

注意:疑问词带不定式在句中作成分时，谓语动词用单数。

The question is how to put it into practice.

问题是怎样把它付诸实施。

7.2 不定式作补语

1) 动词+宾语+不定式(to do)

advise allow appoint believe cause challenge command compel consider declare drive enable encourage find forbid force guess hire imagine impel induce inform instruct invite judge know like order permit persuade remind report request require select send state suppose tell think train trust understand urge warn

例句：

a. Father will not allow us to play on the street.

父亲不让我们在街上玩耍。

b. We believe him to be guilty.

我们相信他是有罪的。

Find 的特殊用法：

Find 后可用分词做宾补，或先加形式宾语，再加形容词，最后加带to 的动词不定式。find后也可带一个从句。此类动词还有get，have。

I found him lying on the ground.

I found it important to learn.

I found that to learn English is important.

典型例题:

The next morning she found the man ___ in bed，dead.

A. lying B. lie C. lay D. laying

答案：A.find的宾语后面，用分词或分词短语，起宾语补足语作用。现在分词表达主动，也表达正在进行，过去分词表达被动。

2) to + be 的不定式结构，作补语的动词。

Acknowledge, believe, consider, think, declare(声称), discover, fancy(设想), feel find, guess, judge, imagine, know, prove, see(理解), show, suppose, take(以为), understand

We consider Tom to be one of the best students in our class.

我们认为汤姆是班上最好的学生之一。

典型例题

Charles Babbage is generally considered ___ the first computer.

A. to invent B. inventing C

就是“to+动词原形”的形式，如：
to do
to go
动词后面可以跟宾语和状语等，这就是不定式短语，如：
to play basketball
to look carefully

动词后面加to再加动词的形式
是否跟to跟具体动词的词性有关系