英语非谓语动词用法讲解举例（一）
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（1)疑问词+不定式结构 疑问词who，what，which，when，where和how后加不定式可构成一种特殊的不定式短语。它在句中可以用作主语、宾语...
（1)疑问词+不定式结构
疑问词who，what，which，when，where和how后加不定式可构成一种特殊的不定式短语。它在句中可以用作主语、宾语、表语和双重宾语。如：
When to start has not been decided．何时动身尚未决定。(主语)
I don't know what to do．我不知道该怎么办。(宾语)
The difficulty was how to cross the river．困难在于如何过河。(表语)
I can tell you where to get this book.我可以告诉你哪里可以买到此书。（双重宾语）
注）A.有时疑问词前可用介词，如：
I have no idea of how to do it.我不知道如何做此事。
B.动词know 后面不能直接跟不定式作宾语，只能跟疑问词（如：how, what）+不定式：
While still a young boy, Tom knew to play the piano well and as he grew older, he wrote operas, the most famous of which is Carmen.
(2)介词except和but作“只有…，只能…”讲时跟不定式结构（but与不带to的不定式连用）。
When the streets are full of melting snow, you cannot help but getting your shoes wet.
（3）某些形容词，如：careless等不定式后可以加of来引导出其逻辑主语。这类词主要有：absurd, bold, brave, courageous, careful, careless, clever, wise, foolish, silly, stupid, good, nice, kind thoughtful, considerate, greedy, generous, honest, modest, polite, rude, cruel ,selfish, wicked, wrong等
It is very kind of you to help me．你帮助我太好了。
间或也可用for + there to be表示（而且there后面的不定式只能是to be）。
It's a great pity for there to be much trouble in the company.太遗憾了公司里有这么多的麻烦。
相关关键字： 英语 非谓语 动词
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