It's there a difference between 下面 and 下?
Only guessing, 下面 can be more emphatic and it can also stand alone when the object has been mentioned before. For ex two pp are talking - 桌子上有一瓶水。 - 下面有什么?(not 下有什么)
The table bottom side has what?
what is the difference between 桌子下面有什么 and 桌子下面是什么?
Below the table should be accepted
And it now is, thanks!