1. Are you free tomorrow?你明天有空不?

　　2. Would you mind if I stopped by later? 我晚点去拜访你吧，方便吗?

　　3. When would be a good time for me to come over? 我什么时候过去比较方便?

　　4. Can I come over right now? 我现在可以过去吗?

　　5. I'll be there by 6 o'clock.  我六点过去。