He sat down and watched the cat play with a dog.那个play为什么不是ing形式或过去式
问题描述：
He sat down and watched the cat play with a dog.那个play为什么不是ing形式或过去式
答
watch sb do
固定搭配
例如 泰坦尼克号最后的对白 JACK对ROSE
you are gonna have a lot of babies and watch them grow.