Are these sentences all OK? I just called to check how you are doing. I just wanted to check how you are doing. And can I use these interchangeably? We haven't talked in a while, so I thought I would call and ask how you were doing. We hadn't talked in a while, so I thought I would call and ask how you were doing. We haven't talked in a while, so I just wanted to check and see how you are doing. We hadn't talked in a while, so I just wanted to check and see how you are doing. We haven't seen each other in a while, so I just wanted to check and see how you are doing. We hadn't seen each other in a while, so I just wanted to check and see how you are doing