7 ** Rephrase the sentences using modal verbs.
1. It's prohibited to eat or drink in the computer room.
You mustn't eat or drink in the computer room.
2. We are obliged to tip the waiter. He's been so helpful.
3. It's not necessary for you to defrost the fridge. It does it itself.
4. Is it possible for me to use your phone to make a call?
5. Do you want me to download the program for you?​