（1）疑問詞+不定式結構
* w dNZ 疑問詞who，what，which，when，where和how后加不定式可構成一種特殊的不定式短語。它在句中可以用作主語、賓語、表語和雙重賓語。如：
RXO}mu]Iu When to start has not been decided.何時動身尚未決定。（主語）
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ey I don't know what to do.我不知道該怎么辦。（賓語）
pmUC4=&e The difficulty was how to cross the river.困難在于如何過河。（表語）
F6{Q1DqI I can tell you where to get this book.我可以告訴你哪里可以買到此書。（雙重賓語）
>U:.5Tch'V �。ㄗⅲ〢.有時疑問詞前可用介詞，如：
1OFrxSg I have no idea of how to do it.我不知道如何做此事。
\!)1n[N B.動詞know 后面不能直接跟不定式作賓語，只能跟疑問詞（如：how, what）+不定式：
W1}d6Sbg 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.
0d ,& ) �。�2）介詞except和but作“只有…，只能…”講時跟不定式結構（but與不帶to的不定式連用）。
E_xCRfw_i] When the streets are full of melting snow, you cannot help but getting your shoes wet.
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H �。�3）不帶to的不定式
Cj)*JZV G 1）在表示生理感覺的動詞后的不定式不帶to。這類詞有：
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pMB7 feel 覺得 observe 注意到，看到 overhear聽到
X5)].[d watch注視 listen to聽 perceive察覺，感知
@vi;P ^1! notice注意 see看見 look at看 hear聽
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_9e On seeing the young child fell into the lake，Eric sprang to his feet，and went on the rescue.
M;X}v#l|XI 2）另一類是某些使役動詞，如make, let，have等。如：
G/Yqvu,2! Let him do it.讓他做吧。
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I would have you know that I am ill.我想要你知道我病了。
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