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

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

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.

it's not working 现在不工作了， 是进行时
it doesn't work 是一般现在时是指一直不工作。
it's not work 翻译成不是工作，要不就语法不对了。
所以你说不起作用，应该是突然发现的吧，应该是it's not working

最后一种说法是对的。

中国人喜欢用一般现在时。将来你说的时候也有可能会按照逻辑选择说it doesnt work. Or It works.