I'm not really good at sports. I ......... rollerblade well.
can't
It's Martha's birthday. You ........ buy her a birthday present.
should
It is not permitted to drive before 18.
You mustn't drive before 18.
It is not a good idea to eat junk food.
You shouldn't eat junk food.
It is forbidden to go to restaurants now, so you ............. go to that restaurant.
mustn't
It's an obligation to respect your classmates.
You must respect your classmates.
The weatherman says it is possible that it snows tomorrow.
It can snow tomorrow.
That dress is awful. You ........... wear it!
shouldn't
It's a good idea to eat healthy food.
You should eat healthy food.
I'm really good at languages! I ....... speak English, German and Japanese.
can
It's impossible for her to speak Chinese.
She can't speak Chinese.
The English exam is tomorrow. You ....... study very hard today.
must