Помогите пожалуйста дам 20-30 балов

1. Kate is standing at the corner. She is waiting for the bus. She has been waiting for 20 minutes. 2. Right now we're in class. We are doing the exercise. We have been doing this exersice for a couple of minutes. 3. Scott and Rebecca are talking right now. They have been talking on the phone for over an hour. 4. I am sitting in class right now. I have been sitting since afternoon. 5. You look busy right now. What are you doing? I am working on my physics experiment. It's a long and difficult experiment. How long have you been working on it? I started planning it last January. I have been working on it since the