疑問詞帶不定式在句中作成分時(shí)，謂語動(dòng)詞用單數(shù)。如：the question is how to put it into practice. 問題是怎樣把它付諸實(shí)施。

新東方冬令營 語法講解  不定式作賓語

　　動(dòng)詞+ 不定式

　　afford, aim, appear, agree, arrange, ask, be, decide, bother, care, choose, come, dare, demand, desire, determine, expect, elect, endeavor, hope, fail, happen, help, hesitate, learn, long, mean, manage, offer, ought, plan, prepare, pretend, promise, refuse, seem, tend, wait, wish, undertake

　　the driver failed to see the other car in time.　司機(jī)沒能及時(shí)看見另一輛車。

　　i happen to know the answer to your question.　我碰巧知道你那道問題的答案。

　　2) 動(dòng)詞+不定式；動(dòng)詞+賓語+不定式

　　ask, beg, choose, expect, hate, help intend like, love, need prefer, prepare, promise, want, wish

　　i like to keep everything tidy.　我喜歡每件東西都保持整潔。

　　i like you to keep everything tidy.　我喜歡你使每件東西都保持整潔。

　　i want to speak to tom.　 我想和湯姆談話。

　　i want you to speak to tom.　 我想讓你和湯姆談話。

　　3) 動(dòng)詞+疑問詞+ to

　　decide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tell　　

　　please show us how to do that. 請(qǐng)演示給我們?nèi)绾稳プ觥?/p>

　　there are so many kinds of tape-recorders on sale that i can't make up my mind which to buy.有這么多的錄音機(jī)，我都拿不定主意買哪一種。