动名词的复合结构：凡是一个动词的后面可以加动名词，就可以加动名词的复合结构。
动作发出者 + 动名词;当动作发出者名字给出时：名词所有格 + 动名词;当动名词的`复合结构在文章中出现，且动作发出者在前文中提过时：形容词物主代词+ 动名词。
形容词物主代词：his， her， my， your， their， our。代词宾格：him， her， me， you， us， them。
第二点：want 想要; want to do sth. 想做某事; want doing 客观需要或缺乏。
18. Your hair wants _B_. You d better have it done tomorrow.
A cut B cutting C to cut D being cut
注意：want doing 中doing表示的是被动含义。
48. This room is so dirty that it wants _A_.
A cleaning B to clean C being cleaned D cleaned
第三点：mean 意味; mean to do sth. 打算做某事，意欲 ;mean doing 意味着， 的意思是
25. There s a man at the reception desk who seems very angry and I think he means _B_ trouble.
A making B to make C to have made D having made
55. The children went there to watch the iron tower _D_.
A to erect B be erected C erecting D being erected