Here are the answers for the sentences based on the provided prompts:

1. My dad **hasn't smoked** for a long time.
2. **Does** he **like** to go for a picnic with his friends?
3. Don’t come to her house at 8 am tomorrow because she **is learning** at school that time.
4. Last evening, after John **had** dinner, he **visited** his granddad.
5. Lan **cleans** the floor twice a day.
6. My brother **has been** an engineer for 5 years until now.
7. **Has** he **been** very fat?

Feel free to ask if you need further assistance!