一、动词不定式：动词不定式，为非谓语动词。在英语语法中，动词不定式是指动词中的一种不带词形变化从而不指示人称、数量、时态的一种形式。它之所以被称做不定式，是因为动词不被限定，或者说不被词性变化所局限。
二、动词不定式的形式：
1.一般式：一般式表示的动词，有时与谓语动词表示的动作同时发生，有时发生在谓语动词的动作之后。一般式结构为: to+动词原形。
例如：I hope to see you again. 我希望再见到你。
2.完成式：表示的动作发生在谓语动词表示的动作之前。完成式结构为：to have+动词的过去分词。
例如：I'm sorry to have given you so much trouble.很抱歉给你添了那么多麻烦。
3.进行式：表示动作正在进行，与谓语动词表示的动作同时发生。进行式结构为： to be+ 动词的现在分词。
例如：He seems to be eating something.看起来他正在吃饭。
三、动词不定式的作用：动词不定式在句中可以作句子除谓语之外的任何句子成分。
动词不定式 知识点题库
The difference in size and weight from the earlier version makes the iPad mini easier.
A . heldB . holdingC . be heldD . to hold
________ the convenience of digital payment, many senior citizens started to use smart phones.
A . To enjoyB . EnjoyingC . To have enjoyedD . Enjoy
The question of whether a picnic was still under discussion.
A . to haveB . havingC . haveD . had
Everyone should work hard and do what
they can (fight) against national smog.
It's difficult for a small
supermarket to (竞争) with the big
supermarkets.
Lady Gaga was reported _____ an Oscar Award in 2019 for the Best Original Song Shallow in the film A Star Is Born.
A . to awardB . awardingC . to have been awardedD . being awarded
The soldiers were warned to remain hidden
and not to e themselves.
The students will be instructed (handle)
such problems.
(trace) the source of the
viruses soon, researchers are making a survey all related persons and creatures.
Body language is said to up 55% of a first
impression while what you say just 7%.
据说身体语言占第一印象的55%而你却说只有7%。
I try to (使……信服) him of the reality of the danger.
People found it difficult(recover) from the serious damage.
The government has already permitted the company (use) special materials to make it easier for the vehicle to fly.
I like getting up early in the morning. The morning air is good to (breath).
I was permitted (talk) to the prisoner. The guards permitted me (bring) my camera and tape recorder.
With great discrimination, every one of us has the potential (be) a critical news reader.
They are trying to (确认) what is wrong with the present system.
Tom couldn't wait (make) his way to the agency to buy a kit for space exploration.
He made a promise (come) here on time tomorrow.
They knew that the difference was going on, but they chose to i it.
