不起作用 it's not working 还是 it's not work 还是 it doesn't work?

问题描述:

不起作用 it's not working 还是 it's not work 还是 it doesn't work?

It doesn't work是最常用的.
It's not working强调当前不工作的状况也可以.
It's not work是病句,或者不是这个意思.