- 动词+宾语+不定式（to do ）。如：
He warned me to be careful.
I want you to speak to Tom.
What makes you think so?（不带to的不定式）
注：可以用动词不定式做宾补的动词有：ask, tell, order ,want ,get, would like, like, advise, invite, allow, help, wish,warn, expect, prefer, encourage
- 表见解、看法的动词结构可为：动词+宾语+ to be 的不定式结构。如：
We consider Tom to be one of the best students in our class.
The book is believed to be useful.（被动语态）
(3) There +不定式。如：
We didn’t expect there to be so many people there.我们没料到会有那么多人在那里。
注意：（1）有些动词需用 as 短语作补语，像regard, think, believe, take, consider。如：
We regard Tom as our best teacher. 我们认为汤姆是我们最好的老师。
Mary took him as her father. 玛丽把他当作自己的父亲。
（2）在动词feel （一感），hear, listen to（二听），have, let, make（三让），notice, see, watch, observe, look at（五看）(即：吾看三室两厅一感觉)等后面的补足语中，不定式不带to，但变为被动语态后，必须带to。如：
They saw the boy fall off the tree. The boy was seen to fall off the tree.
I often help him （to）clean the room.
I helped him (to) find his things.