1. Alege forma corectă a verbului:
 You can't/shouldn't  stay  up  so late  if you're so tired in the morning.
 'Keep  off the grass' means that you can't / don't   have to walk on the grass. 
'Keep  off the grass' means that you can't / don't   have to walk on the grass. 
 You mustn't / don't  have be late for work. 
Thank you for the lift , but I'm afraid you can't / don't have to come in .  
You  mustn't/might not put your feet on the table.