It's weeks since I last saw him.
Hello all, I have a question.
I did my grammar practice, there was one dialogue as follows:
—— I haven't seen Andrew for weeks.
—— Nor me. It's weeks since I last saw him.
I would like to know "It's" is shorted for what? It is? It was? It has?
And I would probably say :"It has been weeks since I last saw him."
Please tell me how should I say this sentence, thank you!