他在课桌上画画。

He draws on the desk.

他在课桌上写作业。

He does his homework on the desk.

他们的论文在课桌上乱成一堆。

Their papers were mixed up in a heap on the desk.

我刚要走,就在那时我意识到了我把钱落在课桌上了.

I was about to go when i realized that I had left the money the desk.

不知什么时分，本人那心爱的小花杯呈现在课桌上。

Sometime, my lovely little flower Cup appear on the desk.