在英语越来越普及的21世纪，英语水平的高低已经成了大学生是否能找到好工作的评定标准。为帮助大学生掌握权威的英语知识。特提供以下资料：
不定式在句中充当结构
在句中可作除谓语以外的一切成份：主、表、宾、定、状、(主、宾)补语。
1. 不定式作主语
To say something is one thing, to do it is another.
It is not fair to blame them for the accident. (it 形式主语)
2. 不定式作表语
My suggestion is to carry out the plan immediately.
The question is how to organize the work. (不定式的特殊结构，见后)
3. 不定式作宾语
He offered to go with us.
I don't know where to get the books.
(不定式的特殊结构，见后)
常跟to do(不定式) 作宾语的v:
afford, agree, arrange, ask, attempt, beg, care, choose, claim(声称),dare, decide, decline(谢绝),desire, determine, fail, intend, learn, long, mean, offer, pretend, promise, refuse, seek, tend, undertake(承担), volunteer.
不定式的特殊结构
构成：疑问代词、副词及whether / if + to do
常跟疑问代词、副词及whether / if + to do作宾语的v.有
ask, consider, decide, discover, discuss, explain, find out, inquire, forget, know, learn, remember, show(演示),tell, think, understand, wonder.
Examples:
I still don't know whom to turn to for help.
They are trying to find out how to solve the problem.
Show me where to put the books.
They haven't decided yet (as to) whether to accept our offer of help.
如果不定式作宾语又跟有补语，通常要用“it”作形式宾语，而将不定式放到补语后面去。
eg. 他们发现提前做好一切准备是不可能的。
They found it impossible to get everything ready in advance.
I consider it my duty to point out their shortcomings.
4. 作宾/ 主语补足语
Mr. Smith wants his son to become a lawyer.
The suspected man was seen to enter the building.
跟不带“to”的不定式作宾补的v:
see, hear, look at, listen to, feel, observe, watch, notice 等感官v 及let, make, have, keep.
The teacher makes us write a composition every week.. (被动语态中要加上“to”)