Function -2.Filling

You must/have to You’re required to It is necessary to…

You don’t have to / aren’t required to It’s not necessary to

You’re allowed to You can / may…

You aren’t allowed / can’t / shouldn’t …

You can’t / mustn’t You’re forbidden to It’s against rules to

affirmative （肯定）

negative （否定）

Use the correct expressions to fill in the chart.