Ex.1:
I have to,
I don't have to,
have to,
don't have to,
do you have to,
has to
Ex.2:
1. has to go
2. don't have to go
3. has to brush
4. don't have to use
5. don't have to wear
6. has to see
Ex.3:
1D
2C
3A
4B
Ex.5:
1. I have to go to school on Saturday
2. My mom has to cook everyday
3. My best friend has to get the bus home from school
4. I have to do chores when I've got a headache