Answer:
1. You CANT swim here. It's forbidden.
2. She CANT cook tonight. We're having dinner at a restaurant.
3. We're going now because we HAVE TO be home by 10:00.
4. I MUST phone you because my phone wasnt working.
5. These questions are easy. I CAN answer all of them.
6. That's a nice necklace. In my opinion you MUST buy it.
7. Debbie COULDNT go to the party because she was ill.
8. I'm busy in the morning but we CAN meet in the afternoon.
9. Lisa DOESNT buy clothes. She makes her own.
10. I'm not sure but Mike can go out without a coat.