You mustn't stay up late- you've got school
tomorrow morning.
We needn't leave the door open- Kate has got a key
You needn't write to your parents about this - I've already written to them
You needn't ride your bike so fast- we've got plenty of time
You needn't stay up late to learn this poem- I'll learn in the morning.
We mustn't leave the door open- the rain will come in
You mustn't write to Ann about this - if you do, she'll tell everybody
You mustn't ride your bike so fast- the road is wet