4-10   Can I check out late?   

This is room 704.   I'm leaving today.   What time is checkout?   Can I check out late?   Can I stay another two hours?   It would really help me out.   That would be great.   That would be a big help.   I'd really be grateful. 

4-10 这是704号房。

我今天要离开。退房时间是什么时候？我能不能晚一点退房？我可不可以多待两个小时？这真的会帮了我的忙。那会很棒。那会帮我很大的忙。我会非常感激。