她那份工作干不了多久。

She won't last long in that job.

我要是觉得冷就干不了活。

I can't work if I'm cold.

你说干不了是什么意思？这不是小事一桩嘛！

What do you mean you can't do it? It'll be like shooting fish in a barrel!

通常，你只会无精打采地坐着，热得干不了别的事情。

Usually, you would just sit listlessly, too hot to do anything else.

一年到头，我一星期挣一镑左右，因为冬天里干不了多少活。

Take the year round, I make about a pound a week, because you can’t do much in the winter.