ex. 5
1. My parents have read the book, but they haven't seen the film.
2. My sister has bought a new game console, but she hasn't used it yet.
3. I have done my project, but I haven't sent it to my teacher.
ex. 6
1. Have they sold the house? Yes, they have.
2. Has she won the competition? No, she hasn't.
3. Have you ever been to London? No, I haven't.
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