4. A. I must work hard.
B. I have to work hard.
C. I may work hard.
A and B talk about obligation. A is internal, it’s important for you, B is external – someone makes you do it. C may talks about possibility, if I’m not sure it
7. A. I’ve been forced to wear a uniform at school B. It’s compulsory to wear a uniform at my school. C. It’s prohibited not to wear a uniform at my school
A,B- obligation, C- prohibition
5. A. You should easily pass the test.
B. You should pass the test.
C. You have to pass the test to graduate.
A talks about probability, I’m almost certain of it. B talks about advice, it’s a good idea to do it, but it’s still up to you to decide. C talk about obligatio
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
6. A. We could watch a movie.
B. Shall we watch a movie?
Both talk about suggestion
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
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