Celta pre-interview questions

I'm having trouble with finding the one that doesn't belong here any help? I answered do you think I'm right or wrong? And I'd like to know why or explain it to me. I don't want just the answer :)

a. You can’t smoke here. Because it is in the present the rest are the future.

3. a. You can’t smoke here. b. You don’t have to wear a suit. c. You mustn’t be late. d. You aren’t allowed to buy alcohol.

[banderas]

Originally Posted by wolfcoto

I'm having trouble with finding the one that doesn't belong here any help? I answered do you think I'm right or wrong? And I'd like to know why or explain it to me. I don't want just the answer :)

a. You can’t smoke here. Because it is in the present the rest are the future.

3. a. You can’t smoke here. b. You don’t have to wear a suit. c. You mustn’t be late. d. You aren’t allowed to buy alcohol.

it is B
you can not smoke here=it is forbidden/no choice
you musn't be late=it is forbidden to be late/no choice
you aren't allowed to buy alcohol=it is forbidden/no choice

you don't have to wear a suit= it is not recommended but you can if you want/choice

[David L.]

The answer is B.
Think about them in terms of giving an order versus giving advice and you'll think of the correct term for each.