动词不定式的否定式由 not/never＋to do 构成，另外还有 in order not to do，so as not to do。
I told him not to do it.
我让他别那样做的。
Father warned me never to drive after drinking.
父亲警告我不要酒后开车。
动词不定式的被动语态
当不定式逻辑上的主语是不定式所表示的动作的承受者时，不定式一般要用被动式。
I'm pleased to have been given this opportunity.
给了我这次机会我很高兴。
连接词＋不定式
连接代词和连接副词及whether后可接不定式，在句中起名词作用，可充当主语、表语和宾语。
I know what to do.(I do what)
我知道要做什么。
How to solve the problem is very important.
怎样解决这个问题是非常重要的。
【链接训练】
①—Where should I send my form?
—The Personnel Office is the place ________.
A．for sending it
B．to send it to
C．to send
D．to send it
【解析】 考查不定式作宾语的用法。根据send的用法send sth.to some place可知选B。
【答案】 B
②The host didn't want his house ______ for the night，so we had to try knocking at another door.
A．being stayed
B．to stay in
C．to be stayed
D．to be stayed in
【解析】 want后的非谓语动词作宾语补足语时，通常用动词不定式，此处宾语与补足语是被动关系，故用不定式的被动式，因此选D。
【答案】 D
③I'm going to Shanghai.Do you have anything ________ to your parents?
A．to take
B．take
C．taking
D．to be taken
【解析】 考查不定式作定语。动词take的逻辑主语并不是you，而是anything，故要用不定式的被动语态，意为“你有东西(要我)带给你的父母吗？”
【答案】 D
④—Where is George？He said he would meet me here at 3 o'clock.
—He seems ________ with Mr.Brown in the office.
A．to talk
B．talking
C．to have talked
D．to be talking
【解析】 不定式的进行式表示正在进行的动作或状态。
【答案】 D
⑤What made me sad was that I went to see her the day before yesterday only ________ her dead on her bed.
A．to find
B．finding
C．found
D．find
【解析】 only to find作结果状语，通常表示一个令人失望的、沮丧的、预料之外的结果。
【答案】A
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