I`m sure that he isn´t at the museum.
He can´t be at the museum.
Maybe we're in the future.
We may/might/could be in the future.
Perhaps they are dinosaur bones.
They may/might/could be dinosaur bones.
I am sure that the time machine is broken.
The time machine must be broken.
Maybe we won´t see a dinosaur.
We may/might not see a dinosaur.
Is it possible they´re in Mexico.?
Could they be in Mexico?
Is it possible it is a time machine?
Could it be a time machine?
I know the shop is near here.
The shop must be near here.
Perhaps I am wrong.
I may/might/could be wrong.
Perhaps lunch isn´t ready until one o´clock.
Lunch may/might not be ready until one o´clock.
Is it possible he is sleeping?
Could he be sleeping?
