我可以与你们在一起吃午餐吗?（正在吃着）.Translate it into English

我可以与你们在一起吃午餐吗?（正在吃着）.Translate it into English
Please provide a better answer and explain in mandarin.
1)May I join your lunch.
2)May I have lunch with you now.
3)May I have this lunch with you now.
4)May I have the lunch with you now.
5)May I have lunch with you .
6)May I have this lunch with you.
7)May I have the lunch with you.