Exercițiul 6
1. We haven't finished our homework yet.
2. Alice has been waiting for her sister all morning.
3. I have played the piano when I was five years old.
4. Have you ever tried Indian food? It's very spicy.
5. Henry and I have been playing football for the last four years.
Exercițiul 7
1. You mustn't talk in the library.
2. You might see a doctor.
3. I must play the piano.
4. May I use your pen, Sir?
5. He could come to see us...