1)I ... wear a tie; I do it because I like wearing ties.don't have to
2)John... put salt in her food; the doctor said she can't eat salt. mustn't
3)The doctor has put me on a strict diet. I ... eat more fruit and vegetables and do more exercise. must
4)You... be late. It's the most important meeting of the year.mustn't
5)Mike ... tell the boss what happened, or he'll fire him.has to
6)Teacher: 'You ... arrive on time for class.must
7)I don't like these clothes, but I ... wear them at work. have to
8)You ... smoke in here; smoking is not allowed.mustn't
9)You ... tell anyone; it's a secret.mustn't
10)We ... cook more; there's enough food. don't have to
11)Visitors to the zoo ... feed the animals.mustn't