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TRUE/FALSE: We use MUST and MUSTN'T to talk about obligation.
FALSE
When it is not obligatory to do something, we use...
NEED TO
We use this modal verb to talk about prohibition
MUSTN´T
We use MUST/NEED TO to talk about rules.
MUST
(We are in a test) We MUSTN´T/DON´T NEED TO look at your classmates sheet.
MUSTN´T
I MUST/NEED do my homework before dinner.
MUST
You MUST/MUSTN'T be over 18 to buy alcoholic drinks..
MUST
You DON´T NEED TO/MUSTN´T wait for me, I will be late.
DON´T NEED TO
(Imagine that you are going to get on an airplane.) You MUSTN´T/ DON´T NEED TO smoke.
MUSTN´T
I MUST/DON´T NEED TO get up early tomorrow, I can stay in bed longer.
DON´T NEED TO
I DON'T NEED TO/MUST to go to the supermarket. There´s nothing to eat!
MUST
I think he MUST/NEEDS TO quit. He is such a bad cook!
MUST
Chuck NEEDS TO/NEED TO relax a bit, if he doesn’t want to be ill.
NEEDS TO
Mum DOESN´T NEED TO/MUSTN'T cook today, we go to a restaurant.
DOESN´T NEED TO
I want to be a millionaire, so I DON'T NEED TO/MUST work very hard.
MUST
If Peter wants to be a millionaire, I think he MUST/NEED work harder.
MUST
