不定式短語和疑問詞連用 (who, whom, whose, what, which, when, where, how,還包括whether)
(1)做主語
例如：
Who to turn to is what she wants to know. 找誰幫忙是她想知道的。
It’s problem what to do. 幹什麼還是個問題。
How to be wealthy, healthy and happy will always remain a question mark. 怎樣才能富有，健康和幸福將永遠是個問號。
(2)做表語
例如：
The question is which to take first. 問題是先拿哪一個。
What remains for you to explain is how to put the plan into practice and whose help to seek. 剩下需要你解釋的是怎樣實施計劃以及尋求誰的幫助。
The question is which of the methods to adopt. 問題是採取這些方法中的哪一個。
(3)作賓語
常用這一結構作賓語的動詞有ask, consider, decide discuss, explain, forget, find out, guess, inquire, know, learn, remember, see(=understand),show,settle(=decide),tell(=know),think,understand,wonder等。
I’ve found out where to buy them cheaply. 我發現了在哪裡買這些東西便宜。
Do you remember when totch off the machine? 你記得什麼時候關掉機器嗎?
I can’t tell what to do . 我說不好怎麼辦。
How can you tell which button to press? 你怎麼知道按哪個按鈕?
You know very well when to say what and how to say it.
你很清楚什麼時候說什麼話以及怎樣說。
He can’t decide what time to leave or whether to leave at all.他不能決定何時離開或者到底是否離開。
有些雙賓語及物動詞，也可用這個結構做直接賓語。常用的有tell, inform, show, advise, ask, teach,等。如：
I showed her how to use the remote control. 我向她演示怎樣使用遙控器。
The salesman told him whichtch to turn on first. 售貨員告訴他先開哪個開關。
Will you advise me which to buy? 你建議我買哪個?
Please inform me where to get the tickets. 請告訴我到哪裡去弄票。
(4)做定語
例如：
I must find a pen with which to fill in this form(=to fill in this form with). 我必須找支鋼筆填表用。
He offered me some hot coffee with which to refresh me spirit (=to refresh me spirit with).
他給我提供了點熱咖啡提提神。
Nobel began to seek ways in which to make the explosive safer to handle.諾貝爾開始尋找那種炸藥操作起來更安全的方法。
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