大家帮我参考下这句话,英语怎么翻比较好?

it is a pity that you are going back to your country. So when do you think I can give you the list you signed for classes?
我也不知道签下上课的单子啥意思的说。。。

给您一个建议：

如果大家不明白什么是“签下上课的单子”，恐怕没人能帮您翻译。。。