If it rains, the game will be canceled.
もしよろしければ、ご一緒にいかがですか。
If you don't mind, how about joining us?
If it rains, the match will be cancelled.
If you have time, please help me.
If there is any problem, please contact us right away.
Even if I fail, I won't give up.
if; in case; supposing
perhaps; possibly; by any chance