Answer:
1. When the phone rang I had a bath.
2. You wore your new hat when I met you yesterday.
3. When it rained she carried an umbrella.
4. The house was much smaller than you thought at first.
5. When you played the piano, I wrote a letter.
6. Before you mentioned him, I never heard of that author.
7. My friends sang when I came into the room.
8. Rachel decided not to go out because it rained.
9. When he went to see them last night, they played cards. They said they were playing since six o'clock.
10. The little girl asked what happened to her ice-cream.
11. He ate dinner when I went to see him.
12. Last night Lyria listened to the radio when she heard a strange noise downstairs.
Step-by-step explanation: