Выберите самый подходяший вариант.
1. I'm sure that they forgot about our wedding.
a. They can't have forgotten about our wedding.
b. They must have forgotten about our wedding.
2. It's possible that John is not a rich businessman. a John may not be a rich businessman. b John can't be a rich businessman.
3. I think Lisa is learning Italian. a Lisa could learn Italian.
b Lisa could be learning Italian.