1. That girl - not to be - a great hockey player
--> That girl isn't a great hockey player, is she?
2. I - to be - stronger than you
--> I am stronger than you, aren't I?
3. That football team - not to be - very good
--> That football team isn't very good, is it? (team = het!)
4. The swimmers - to be - very fast
--> The swimmers are very fast, aren't they?