动词不定式是指动词的一种不带词形变化从而不指示人称、数量、时态的形式，以下是高考英语一轮复习语法重点知识点：动词不定式，请考生学习。

1. 不定式作补语

有些有动词+宾语+不定式的结构。例如：

advise

allow

cause

challenge

command

compel

drive 驱使

enable

encourage

forbid

force

impel

induce

instruct

invite

like/love

order

permit

make

let

have

want

get

warn

persuade

request

send

tell

train

urge

例如;

Father will not allow us to play on the street.　 父亲不让我们在街上玩耍。

The officer ordered his men to fire. 长官命令士兵开火。

注意：有些动词如make，have，get，want等可用不定式作做宾补，也可用分词作宾补。现在分词表达主动，也表达正在进行，过去分词表达被动。

2) 有些有动词+宾语+不定式的结构，不定式的动词往往是be，不定式一般可以省去。例如：

consider

find

believe

think

declare(声称)

appoint

guess

fancy(设想)

guess

judge

imagine

know

例如：

We believe him to be guilty. 我们相信他是有罪的。

We know him to be a fool. 我们知道他是个笨蛋。(to be 不能省去)

典型例题

Charles Babbage is generally considered　___ the first computer.

A. to invent　B. inventing　 C. to have invented　 D. having invented

答案：C. 一般没有consider+宾语+be以外不定式的结构，也没有consider+宾语+doing的结构，排除A、B、D。consider用动词be以外的不定式作宾补时，一般要求用不定式的完成式，故选C。　3) 有些动词可以跟there +to be的结构。例如：

believe

expect

intend

like

love

mean

prefer

want

wish

understand

例如：

We didn't expect there to be so many people there. 我们没料到会有那么多人在那里。

You wouldn’t want there to be another war. 你不至于想让另外一场战争发生吧。