Hello, here is a brief explanation of ur exercise :
1. She wrote a letter to her friend, and then, she posted it.
2. I didn't go to school last Friday. I was ill.
3. Did they buy some clothes Yesterday? Yes, they bought a pair of trousers.
4. Was the steak good? No, it was not.
5. The cat jumped the fence when it saw the dog.
6. My cousins didn't enjoy the party.
7. Your parents didn't study English at school. They studied French.
8. I waited for an hour but didn't phone.
9. When did you finish your exam?
10. She lived there for a few years, but she didn't like the place.
11. They came to our house yesterday but they didn't stay.
12. What did you say? I didn't hear you.
Hope I helped u ! :D
