Mark: Are you watching the game tonight?
Sue: I might be :)
Cate: yes!!
Mark: I've got my own Fan Zone
Mark: Do you want to join in? 
Sue: hahah
Cate: no, thanks
Cate: I need to be at work early in the morning 
Cate: I will stay at home
Mark and Cate are watching the game tonight. Sue might join Mark but Cate will stay in as she needs to be at work early in the morning.