Is it on the desk?

它在桌子上吗？

Is it in the desk?

它在桌子里吗？

The desk is very old.

这张桌子很旧。

The book is on the desk.

书在桌子上。

The keys are on the desk.

钥匙在桌子上。

Put the book on the desk.

把书放在书桌上。

Are they under the desk?

它们在桌子下面吗？

The eraser is on the desk.

橡皮擦在桌子上。

The computer is on the desk.

电脑在桌子上。

The chair is under the desk.

椅子在桌子下面。