We must / have to go to the supermarket later. We've run out of coffee.
BOTH ARE CORRECT
I had to / must buy a new fridge last week.
HAD TO
Our journey back was a nightmare. We must / had to wait hours for the bus!
HAD TO
You oughtn't to / don't have to arrive late on your first at work.
OUGHTN'T TO
You mustn't / don't have to spill anything on the sofa -it's leather.
You'll have to / you'll need to book a table if you want to go to Gino's on Saturday evening.
BOTH OPTIONS ARE CORRECY
You needn't to / don't have to worry about getting a ticket in advance - you can pay on the train.
DON'T HAVE TO
You shouldn't to / oughtn't to drink so many fizzy drinks. They'are really not good for you.
OUGHTN'T TO
Do I have to / must write a thank-you letter or can I just send an email?
We don't need to / mustn't leave yet. The show doesn't start until 7,30.
DON'T NEED TO
Here's the form. You must to / have to sign it at the bottom.
You don't need to / needn't phone me unless your train is delayed.
BOTH ARE CORRECT
You must / need read this new book! You'll love it!
We don't have to / mustn't be at the airport until 5.00. Our flight isn't until 7.00.
DON'T HAVE TO
He shouldn't / doesn't have to have any more cake. He's already had three pieces.
SHOULDN'T
I should to try / ought to try to eat more vegetables.
OUGHT TO