1) Means "Do it" If you don't do it, you will be in problems.  a) must b) couldn't c) had to 2) Means "Don't do it" If you do it, you will be in problems. a) couldn't b) mustn't c) must 3) We can use them to talk about abilities in the past.  a) must / musn't b) had to / didn't have to  c) Could / couldn't 4) We use them for things that were necessary or unnecessary in the past. a) had to / didn't have to  b) Could / couldn't c) must / musn't 5) When I was a baby I couldn't drive.  a) abilities  b) something necessary c) "Do it or problems"  6) You must pay attention at the school.  a) something unnecessary b) "Do it or problems" c) ability  7) Last Sunday, he didn't have to get up early . a) something unnecessary b) "Do it or problems" c) ability  8) I ________ speak English, now I can. (ability in the past)) a) couldn't b) mustn't c) didn't have to 9) I ________ respect other people (do it or problems) a) must b) had to c) Could

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