If you get a raise, what will you do with the extra money?
PROVIDED
What will you do if you wake up with a cold tomorrow?
UNLESS
What will you do if you can't sleep tonight?
UNLESS
If you receive an unexpected invitation tomorrow, how will you respond?
ON CONDITION THAT
If you find a wallet on the ground tomorrow, what will you do with it?
PROVIDING THAT
What will you do if you hear a strange noise in your house tonight?
SO LONG AS / AS LONG AS
