1 i must to go to the market/shop
i must to cook a dinner
i have to go to school
i have to write a letter to my brother
2 i will have to go to the market/shop
i will have to cook a dinner
i will have to go to school
i will have to write a letter to my brother
3 i had to go to the shop
i had to cook a dinner
i had to go to school
i had to write a letter to my brother