1) 動詞+ 不定式
afford aim appearagree arrangeask be decide bothercarechoose come dare demand desiredetermine expect electendeavor hope fail happen helphesitate learn long mean manage offer ought planprepare pretend promise refuse seem tend wait wish undertake
舉例：
the driver failed to see the other car in time.
司機沒能及時看見另一輛車。
i happen to know the answer to your question.
我碰巧知道你那道問題的答案。
2）動詞+不定式 ； 動詞+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. 我喜歡你年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. 請演示給我們如何去做。
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，我都拿不定主意買哪一種。
注意:疑問詞帶不定式在句中作成分時，謂語動詞用單數。
the question is how to put it into practice.
問題是怎樣把它付諸實施。