1. What are u doing at the momet?
2. We are running becouse it is late
3 Why are Dave and his wife arguing?
4 They are not waiting for taxi
5 Are u using this computer?
6. Is Paul getting dressing?
7. I am not wearing a jacket today.
P. S Можешь сократить am, is, are, но я бы не советовал. И так правильно.