All passengers must wear seat-belts.
My tooth hurts. I think I shouldn't see a dentist.
shouldn't walk on the grass.
You mustn't be kind and polite.
He mustn't whistle inside a house.
Your brother must cat healthy food.
You must read this book. It's really nice.
Greg must spend more time on English grammar.
Объяснение:
must-должен
should-должен
