You be careful what you are saying.Everyone stop when you're doing.

问题描述:

You be careful what you are saying.Everyone stop when you're doing.
貌似这是一种很常见的用法.
但是还是不太明白为啥动词都用了原型

这里两个句子都是祈使句.
其实这You和Everyone都可以去掉.
如Be careful what you are saying.
不过为了指明说话的对象,在口语中经常会加上如You这样的称呼.
另外如:Don't you forget to do your homework.
别忘了做作业.(这里的you也可以省略)