1.去掉to (listen to后跟sb)
2.walk改成walks (第三人称)
3.does改成do (people是复数)
4.waiting后面加for (固定搭配)
5.have改成having (现在进行时)
6.How many改成What(固定搭配)
7.kind改成kinds (all说明是复数)
8.lives改成lived (in 1999说明是过去式)
9.Watch改成Watching(is说明主语是名词)
10.actor改成actors (one of后跟复数)