HELP ME PLEASE!
ПОМОГИТЕ ПОЖАЛУЙСТА!

Look at these rules for a language class. Write sentences with the same meaning using have to/don't have to, can/can't or must/mustn't.

1. It's not necessary to buy the coursebook. You_____buy the coursebook.
2. It's important to be in class by 10.00 a.m. We _____be in class by 10.00 a.m.
3. It's OK to check vocabulary using your mobile phone. You_____check vocabulary using your mobile phone.
4. Don't speak in your own language. Use English! We_____speak in our own language. We_____use English.
5. You decide if you want to bring a dictionary to class. It's not obligatory. You_____bring a dictionary to class.

Work with a partner. Write some of the rules of your language class.