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!