model:you have to dig a deep hole for the tree---

model:you have to dig a deep hole for the tree---
you don't have to dig a deep hold for the tree.
do you have to dig a deep hole for the tree?
1,these trees were planted in1978
2,the man cleans the toilet every morning
3,they'll be ready in a few minutes
4,she'll have to finish her homework before the class
5,mr turner has received my letter
6,betty is going to the farm to help her uncle
7,he was taking a walk in the park at 7:00 yesterday evening