1. I thanked him for everything he had done for us.
2. He found) that letter when he was looking through his old books.
3. I was observing the sky into the telescope when I saw the UFO.
4. I did not like the plan after I had known all the details.
5. When I am retired I will write memoirs.
1. As soon as I see that book. I'll buy it immediately.
2. After he had read the advertisement, he decided to contact the manager.
3. Before he took our proposal, she had long been thinking.
4. When the rain had started , we sheltered in a small cafe.
5. Before I forget about this day, many years (wil have passed.