如何委婉的拒绝别人的请求

我正忙着处理一些其他的事情呢.

focus on sth/doing sth就是集中注意力做某事的意思.

finish off sth的意思就是"完成,做最后加工"
to do the last part of something; to make something end by doing one last thing

I need about an hour to finish off this report.

我需要一小时左右结束这篇报告.

They finished off the show with one of their most famous songs.

他们用自己的一首最著名的歌曲作演出的压台戏.