1. I must go to the shop today.
cook dinner.
do my homework.
go to school.
write a letter to my brother.
2. I shall have to go to the shop tomorrow.
cook dinner.
do my homework.
go to school.
write a letter to my brother.
3. I had to go to the shop yesterday.
cook dinner.
do my homework.
go to school.
write a letter to my brother.