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如:
She wants to come but her parents won’t allow her to.
（3）不定式在句中作某些形容词的状语时. 常见形容词如:happy, glad, eager, anxious, willing, ready等.
如:
I think she should get a job, but you can’t force her of she’s not ready to.
（4）不定式作某些复合谓语时. 常见结构如:be able to, be going to, have to, ought to, used to等.
如:
He doesn’t like fish but he used to.
4．动词不定式符号to的省略
（1）主语部分有to do, 系动词是is或was时, 作表语的不定式常省略to.
如:
The only thing you have to do is (to) press the button.
（2）作介词but, expect, besides的宾语时, 前面有实义动词do时, 常省略不定式符号to. 如:
Tom had nothing to do besides answer letters this morning.
（3）当两个或多个不定式并列时, 其后的不定式符号可省略, 但有对比关系时则不省略. 如:
It is easier to make a plan than (to) carry it out.
（4）主语部分暗含to do, 表示中的不定式符号to可省略.
如:
All I want (to do) is (to) go to school and study hard.
（5）在would rather (not) do, had better (not) do等结构中, 不定式也不带to.
如:
I would rather stay at home than go to the cinema.
（6）在see, watch, notice, hear, listen to, feel, let, make, have等词后作宾补时, 省略 .
如:
Did you notice her enter the room?
5．状语从句中的省略
（1）在when, while, whenever, though, as if等引导的状语从句中, 若谓语有be., 主语跟主句主语相同或同是it时, 则从句的主语和 be常被省略.
如:
Whenever possible, he will come to help.
（2）虚拟条件句常省略if, 将were, had, should提前构成部分倒装.
如:
Should there be a flood, what should we do?
6．定语从句与名词性从句的省略
（1）在限制性定语从句中, 作宾语用的关系代词whom, which, that常可省略.
如:
The girl (whom/that) the teacher spoke to is Liu Ying.
（2）在know, think, consider, suppose, find, believe, say, decide等动词后接宾语从句时, 连词that可省略; 或带有多个宾语从句, 只有第一个that可省略, 其于的不能.
如:
He said (that) the text was very important and that we should learn it by heart.
（3）由which, when, where, how和why引导的宾语从句,
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