1. A. You don’t have to wake up so early.
B. You shouldn’t wake up so early.
C. You needn’t wake up so early.
A and C have similar meaning, it’s not necessary to do it, but you can if you want to. B means that it’s a bad idea to wake up early
2. A. You should listen to what he says.
B. You ought to listen to what he says.
C. You have to listen to what he says.
A and B have similar meaning, it’s a good idea, basically I’m giving advice. You may choose to follow it or not. C means that it’s your obligation, even if you
3. A. We couldn’t go to Paris last year.
B. We didn’t have to go to Paris last year.
A talks about lack of ability in the past, even if we wanted to, we weren’t able to do it. B talks about lack of obligation, it wasn’t necessary for us to go
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