a) I must work more on this project as I want my boss to like it. b) I have to work on weekends this month as two of our other managers are ill. - a) "must" shows us that the obligation comes from the speaker | b) "have to" shows us that the obligation comes from somebody else, a) You mustn’t drive after you’ve drunk alcohol. b) You don’t have to drive tonight, my parents can give us a lift. - a) "mustn’t" is used to show that something is prohibited | b) "don’t have to" shows that it’s necessary to do it, a) Our boss allows us to leave the office earlier on Fridays. b) Our boss lets us leave the office earlier on Fridays.c) Our boss makes us stay in the office until 9 pm. - a) and b) have the same meaning, c) "make" shows that someone forces someone to do something, a) You should be at work when the clients arrive. It will be nice if you could meet them in person. b) You’re supposed to be at work now, what are you doing here? - a) "should" is used here to give advice | b) "be supposed to" shows that there is an obligation, which is broken in this case, a) You must be so worried about this exam. b) Don’t worry so much, it might be easier than you think. c) It can’t be such a difficult test. Ann got a B even though she hadn’t attended most of the classes. - a) you are certain about it b) you are not sure about it c) you are sure it’s not true,

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