Nick: I hurt Tom's leg in football practice. What can I do?
You must should apologize.
You should say sorry.
I should take away your ball.
My sister keeps drawing into my exercise book. And my mum thinks that's funny. What can I do about that?
You must tell your sister that your mum is angry.
Your mum shouldn't laugh when your sister does that. It's very naughty.
My brother never knows where to find stuff.
You should go away.
He shouldn't help you.
You could help him.