Rewrite the sentences with have to,don't have to and mustn't .
1)It isn't necessary for you to come ,but you can if you want to.
You______________________________________
2)We aren't allowed to stay in the classroom at lunchtime.
We________________________________________
3)It doesn't matter if you don't finish your dinner.
You______________________________________
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1) you dont have to come, but you can if you want to
2) we mustnt stay in the classroom at launchtime
3)you dont have to finish your dinner