3. Change and correct the sentences with the use of must or have to in different tenses.
1. You read this book, it's probably great.
2. She felt unwell and leave early.
3 .1 hadn’t enough cash and I pay by cheque.
4. You do what mother says.
5. British pupils stay at school till the age of 16.
6 .1 was lost and ask the policeman the way.
7. The buses were all full, I get a taxi.
8. The chambermaids usually do a lot of work.
9. It is very slippery outside, it has snowed at night.
10 .1 leave home at 7 a.m. not to be late for my job.