We ( to heve ) lunch at home, поставить в 5 времён

1. Present Simple: We have lunch at home.

2. Future Simple: We will have lunch at home tomorrow.

3. Past Simple: We had lunch at home yesterday.

4. Present Progressive: We are having lunch at home.

5. Past Progressive: We were having lunch at home.

Пояснение: так как have lunch не имеет значение обладания (а значение действия), то его можно использовать в группе времен Progressive.