would you mind 【】back before five o'clock?

would you mind 【】back before five o'clock? back before nine o’clock. Are you s____ to come back before 9 o'clock? It is five o'clock.Can you finish it before seven?=Can you f lf you come back before six o'clock ,you can go out.(用on con You can go out,____you promise to be back before 11 o'clock. must Jim finish cleaning the classroom before five o'clock ( he's always back home at five o'clock,____he? –– ________ I come back before 6 o’clock? --- _______ I come back before 6 o’clock? 请问:五点以前这两种翻译有何区别：by five o'clock.before five. Would you mind waiting me for five minutes?