- I don't know what to give Nina as a present... - Well, she is into hiking and camping, so you COULD/CAN'T give her a backpack or a tree tent!
COULD give
I am going camping at the 2d weekend in May/ I guess I need to take a really warm sleeping bag - it CAN'T / MAY be cold at night in May.
MAY be cold
-I'd love to get a tree ten! Are they expensive? - They CAN'T/COULD be expensive - my uncle has got one, and he hasn't got much money.
CAN'T be expensive
-That's a strange tent! It looks like a ballon! - Oh that CAN'T/MUST be a tree tent! I've seen one of tghem on the internet.
MUST be
- Oh look at Jim! He CAN'T/ MUST BE exhausted after doing his homework! He is sleeping on the desk!
MUST BE exhausted
Oh, the water in the lake MUST/ MIGHT be freezing! Nobody is swimming! Even ducks!
MUST be freezing
-Have you seen Mike? - He MUST/MIGHT be at the stadium. But I am not sure - you'd better call him!
MIGHT be at the stadium
-Can we ask your uncle to borrow a tree tent? - Today COULD/ CAN'T be a good day. He is going on holida with it.
CAN'T be
No! We COULD/CAN'T have an English test on 1st June! It is the 1st day of the summer!
CAN'T have
-Is there a capsite hear here? - I am not sure..There MUST/MIGHT be one near the lake. I've seen some people cooking on open fire there.
MIGHT be