watch sb do sth 还是to do还是doingThe teacher often watches us playing解释一下

问题描述:

watch sb do sth 还是to do还是doingThe teacher often watches us playing解释一下
有区别么?是不是看他正在玩必须用ing,其他时态没区别?

watch sb do sth 表示看到了某人做了某事或经常做某事;
watch sb doing sth 表示看到某人正在做某事