СРОЧНО! Английский образуйте past perfect, past simple

Большое спасибо!

3.1 When I got to the party , it had already started raining. 2 I had just finished writing my essay, when Laura phoned.3 Jason opened the window, a white sheet of snow covered the ground. 4 Sue gave me a call to stay they hadn't buy the necessary sportwear yet.5 Lucy couldn't remember the fact her friend had mentioned the day before. 6 When I met Fohn, I understood that I had seen him before. 7 When the second group of tourist arrived in London, the first group had already left .