Task 3:
1. I was happy to see you.
2. Nora was on holidays in Italy.
3. This was my favourite book.
4. The dogs were under the table.
5. Mary was not at school.
6. My mobile was broken.
7. It was a very interesting film.
8. They were good students.
9. We were good sportsmen.
10. This dog wss very friendly.
11. Tom was my best friend.
12. I was at the shopping centre.
Task 6: bạn không ghi phần gạch chân
Task 7:
1. went -> go
2. go -> went
3. bought -> buy
4. weren't -> wasn't
5. not was -> was not
6. have -> had
7. didn't -> wasn't
8. not phoned -> didn't phone
9. send -> sent