Complete the sentences with the verbs below. Use used to if possible. If not, use the past simple form of the verb.

1. My grandfather _______ (smoke) a pipe when he was younger.
Answer: My grandfather used to smoke a pipe when he was younger.

Explanation: "Used to" is used to talk about past habits or regular actions that no longer happen in the present. In this sentence, the action of smoking a pipe was a regular habit in the past, but it no longer happens now.

2. Sarah _______ (play) the piano when she was a child.
Answer: Sarah used to play the piano when she was a child.

Explanation: Again, "used to" is used to talk about past habits or regular actions. Playing the piano was a regular activity for Sarah in the past, but she may not do it anymore.

3. They _______ (live) in New York before they moved to Chicago.
Answer: They used to live in New York before they moved to Chicago.

Explanation: Here, "used to" is used to talk about a past situation or state that has changed. They lived in New York in the past, but they no longer live there as they moved to Chicago.

4. We _______ (go) to the beach every summer during our childhood.
Answer: We used to go to the beach every summer during our childhood.

Explanation: Once again, "used to" is used to talk about past habits or regular actions. Going to the beach every summer was a regular activity for us when we were children, but it may not happen anymore.

5. Jenny _______ (have) a pet dog when she was little.
Answer: Jenny had a pet dog when she was little.

Explanation: In this sentence, the past simple form of the verb "have" is used instead of "used to" because "used to" is not applicable in this context. The action of having a pet dog was a temporary situation in the past but is not a regular habit.

Overall, the use of "used to" or the past simple form of the verb depends on whether the action is a past habit or a temporary situation. "Used to" is used for habitual actions, while the past simple form is used for actions that occurred in the past but were not habitual.