1.You must stay in bed
2.You must not go to the office for three days
3.You must take some medicine.
4.You must drink a lot of water.
5.You must not eat any ice cream.
6.You must take temperature twice a day.
7.You must call me if you have a high temperature.
ex2.
2. SA: Why did she go to the post office yesterday?
SB: Because she had to post some letters.
3. SA: Why did they call the babysitter yesterday?
SB: Because they had to attend a meeting.
4.SA: Why did he call a taxi yesterday?
SB: Because he had to go to the airport.
5.SA: Why did she buy a dictionary yesterday?
SB: Because she had to translate a novel.
6.SA: Why did they go to a restaurant yesterday?
SB: Because they had to entertain some clients.