Unless, in case, if I were you
- We can use unless instead of if not.
I can't help you unless you tell me your problem.
- We can use (just) in case instead of if when we want to stress 'to be safe or prepared.'
I'll take my coat (just) in case it gets cold.
- We can use if I were you to give some advice. (conditional?)
If I were you, I would change football teams.