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eg. It’s my duty to teach you how to be a student of No.3 Middle School.
c) It takes/needs/requires + some time (hours, months, days, patience…) + 不定式
eg. It requires patience to be a good teacher.
2. 作表语：当句子的主语是aim, idea, policy, question, suggestion, wish, task, duty, job, purpose等或者主语是what引导的名词性从句时，后面可以用不定式做表语，用以说明主语所包含内容。
eg. Our most important task now is to make a plan.
注：作表语的不定式都带to，但当主语部分有实义动词do时，to可以省略。
eg. The only thing we can do now is wait and see.
3.作宾语?
The cat said “Remember not to take it next time!”.
a) 可以直接用不定式作宾语的动词很多，常见的有：agree, afford, tend, ask, decide, determine, expect, fail, hope, learn, intend, manage, offer, plan, promise, refuse, want, wish等
I don’t want _____ like I’m speaking ill of anybody, but the manager’s plan is unfair.
A. to sound? B. to be sounded? C. sounding? D. to have sounded
当不定式短语比宾补长时，往往将不定式放到宾补后，而用先行代词it作形式宾语，常用动词有feel, think, find, believe, consider, make等。
The cat felt it terrible to take roller coaster.
b) 不定式一般不作介词的宾语，只有少数介词如but, except等后面可以跟不定式作宾语。一般情况下作介词宾语的不定式都带to，如果but或except所在句子里的谓语动词都是实义动词do, does, did时，通常省略to。
Eg. We have no choice but to wait.
Cf. We can do nothing but wait.
4. 宾语补足语
在SVOC句型中，许多动词都可以按不定式作宾语补足语。
a) 通常作宾语补语的不定式要带to，常用于以下动词之后：ask, tell, advise, allow, enable, expect, force, get, like, order, teach, want, invite, wish, beg等
You should get them to help you.
但在谓语动词believe, find, think, feel, consider, suppose, imagine, prove等后面跟to be…作宾补，不跟to do…
eg. They believe him to be honest.
b) 以下两类动词后跟不定式作宾补时不能带to
①一些表示“致使”意义的动词，如：let, have, make等
②一些表示感觉的动词，如：hear, feel, see, watch, notice等
Don’t let the children trouble you.
I heard someone open the door.
但当这两类动词为被动态时，不定式就成了主补。作主补的不定式必须加上to
His father made him go to bed early.