Ответ:
1. Did you gather the fruit in the garden?
2. How long are we driving? We are driving for 3 hours.
3. How many pages of this book have you read by now?
4. I learned to play the guitar already.
5. Whom are you waiting for? I'm waiting for my friend.
6. Did Tom return from Poland yet? No, he didn't. He comes tomorrow morning.