expression
if you are free; if you have time
Polite invitation or suggestion used when asking someone to do something together, assuming they may have free time.
See also: 暇
お暇なら、一緒に映画を見に行きませんか。
If you're free, would you like to go see a movie together?
お暇なら、ちょっと手伝っていただけますか。
If you have time, could you help me a little?