You know I can't do this, right?

There's nothing I can do about it.

- You have to put a stop to this. / Ты должен это остановить.

- There's nothing I can do about it. / Я ничего не могу с этим поделать.

I cannot tell you...

I cannot tell you how wonderful it is to have you over. / Даже не могу выразить, как это здорово, что вы пришли.

I can't see him like that.

I can't let you do it.

I can't figure out what I ever saw in him.

I'm afraid I can't help you.

There's nothing I can do.

I can't live here anymore.

I can't believe you betrayed us like that.