пример:
O He can't move his arm. Perhaps it's broken.
(might)
It might be broken.
задание:
1 It tastes disgusting. I'm sure it isn't fresh. (can't)
2 He's got a cough and a sore throat. Perhaps he
has a cold. (could)
3 My brother often goes to that café. I'm sure he
knows your sister. (must)
4 It looks bigger than a mouse. Perhaps it's a rat.
(might)