very easy
Rewrite the sentence using an appropriate modal verb.
You have an obligation to me not to tell anyone.
You mustn't tell anyone.
Rewrite the sentence using an appropriate modal verb.
I think it's a bad idea to go out on your own.
You shouldn't go out on your own.
Rewrite the sentence using an appropriate modal verb.
It's prohibited to turn right here.
BONUS LEVEL! DOUBLE YOUR SCORE!
You mustn't turn right here.
Transform correctly.
They had lots of tomatoes, so they didn't buy any.
They didn't need to / didn't have to buy any tomatoes.
Rewrite the sentence using an appropriate modal verb.
I'm not sure if Pete will come to the party.
Pete may/might not come to the party.
Rewrite the sentence using an appropriate modal verb.
It's possible that he is going to Greece in August.
BONUS LEVEL! DOUBLE YOUR SCORE!
He may/might/could be going to Greece in August.
Rewrite the sentence using an appropriate modal verb.
It was a bad idea to go out. The weather was awful.
You shouldn't have gone out. The weather was awful.
Transform correctly.
We bought more food than was necessary.We needn't have bought more food.
Rewrite the sentence using an appropriate modal verb.
It's possible that Steve wasn't invited.
BONUS LEVEL! DOUBLE YOUR SCORE!
Steve may/might not have been invited.
Rewrite the sentence using an appropriate modal verb.
It's a good idea to join a gym.
You should join a gym.
Rewrite the sentence using an appropriate modal verb.
It's against the law to ride a motorbike without a crash helmet.
You mustn't/can't ride a motorbike without a crash helmet.
Transform correctly.
Angie cooked last night but we took her out.
Angie need't have cooked last night.