Please, do exercises 7C a and b on page 225. This is the key:
Grammar Bank 7C
a 1 Janice has to study very hard – she has exams soon.
2 You have to buy a ticket before you get on the bus.
3 Does your sister have to go to London for her job interview?
4 Mike has to wear wear a really ugly uniform at his new school.
5 We have to get up early tomorrow.
6 Harry doesn't have to work today – he has a day off.
7 I have to make a phone call.
8 Do we have to go to bed?
b 1 mustn't
2
3 don't have to
4
5 musn't
6
7
8 don't have to
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