在做GMAT语法的时候，有一类是属于对不定式的考察。这类题目虽然本身没有什么难度，但是一旦句子复杂，就会出现很多因为被迷惑而导致的错误。我们用实例来说明GMAT语法不定式考察知识点解析。
一、首先区分一下to do 和doing：to do 表示打算做某事，但是还没做;doing表示正在做某事
结合具体的词来说：
like： like to do ;like doing
Forget/remember to do/doing(忘记/记得要做某事。忘记/.记得已做过某事)
Stop to do/doing(停下来去做某事;停止做某事
Eg：
Don’t you remember seeing the man before?你不记得以前见过那个人吗?
You must remember to leave tomorrow.你可要记着是明天动身。
Let’s try doing the work some other way.让我们试一试用另外一种办法来做这工作。
Let’s try to work this out(让我们努力把这个问题解决了)
I didn’t mean to hurt your feeling.只是没打算伤害，还没有伤害
I did’t mean hurting you(已经伤害了)
Mary stopped to speak to me
Mary stoppedspeaking to me
二、然后了解一下省to 的动词不定式
使役动词 let, have, make：
感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find
情态动词：had better
I saw him run
The boss made them work the whole night.
we. can’t help laughing (禁不住笑了)
We can’t help to finish it.(不能帮助完成)
I often hear him sing in the classroom.我经常听见他在教室里唱歌。
Do you hear someone knocking at the door?你听见有人在敲门吗?
三、在被动语态中则to 不能省掉。
I appreciate having been given the opportunity to study abroad two years ago.
He was heard to sing in the classroom
四、不定式在句子中可以充当很多成分，如名词，形容词或副词：
◆ Noun: I love TO SWIM. To swim 作为love 的宾语.
◆ Adjective: The person TO MEET is here. To meet 修饰名词person .
◆ Adverb: Sue paused TO EAT lunch. To eat 修饰动词paused .
对于不定式的使用，我们也更应该关注不定式所要表达的目的：
Right: The contractors demolished the building TO KEEP it from falling down accidentally. demolished 的发起者是contractors ,同时也是不定式to keep的发起者，它描述了demolish 的目的，这里的it 指代building。
我们再看一个例子：
Wrong: The building was demolished TO AVOID falling down accidentally. 例子中building 本身不可能AVOID falling down，对于上面例子可以这样修改：The building was demolished TO KEEP IT from falling down accidentally. 这里的it 指代building ，经过这样修改，building 变成了不定式的宾语。不定式虽然可騨发名词用但还是和名词有许多不同的地方，比如不能作为介词的宾语。
》》点击了解GMAT语法不定式用法全解析
五、下面我们就来练一道题目：
Australian embryologists have found evidence that suggests that the elephant is descended from an aquatic animal, and its trunk originally evolving as a kind of snorkel.
A that suggests that the elephant is descended from an aquatic animal, and its trunk originally evolving
B that has suggested the elephant descended from an aquatic animal, its trunk originally evolving
C suggesting that the elephant had descended from an aquatic animal with its trunk originally evolved
D to suggest that the elephant had descended from an aquatic animal and its trunk originally evolved
E to suggest that the elephant is descended from an aquatic animal and that its trunk originally evolved
解析：
A. Suggest that… and that…. 第二个that不能省略，且and前面不需要逗号
B. Suggest的用法不符合习语
C. 句子使用过去完成时没有根据，with部分结构错误
D. 宾语从句平行，第二个that不能省略
E. 正确
以上便是百利天下小编为大家介绍的GMAT语法不定式考察知识点解析的内容介绍，希望大家在以后的GMAT考试备考中能够掌握这些知识，相信通过大家细心努力备考在接下来的GMAT考试中一定会取得满意的GMAT数学成绩。
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