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英语有个很有用的结构，就是：疑问词+不定式动词（question word + to-infinitive）。 疑问词是疑问代词who, whom, what, which, whose和疑问副词when, where, how, why 。此外，连接词whether也适用。 疑问词+不定式动词结构有何功用呢？其主要功用有下列五种： ⑴当主语，如： ● When to hold the meeting has not yet been decided. ● Where to live is a problem. ● How to cope with the rising cost of living becomes a daily discussion topic. ⑵当宾语，如： ● We must know what to say at a meeting. ● He could not tell whom to trust. ● Do you know how to play bridge? ⑶当补足语，如： ● The problem is where to find the financial aid. ● The question is who to elect. ⑷当名词同位语，如： ● Tom had no idea which book to read first. ● Do you have a rough impression how to do it? ⑸当宾语补足语，如： ● Jim is not sure whose to choose. ● Mary and John are not certain whether to get married or not. 适用于疑问词+不定式动词的动词包括：know, see, decide, tell, ask, consider, discover, explain, forget, guess, hear, imagine, inquire, learn, remember, think, wonder, understand等。 | 
