Quote Originally Posted by Antonio1986 View Post
iCake the preposition под does not require a Tvoritel'nyi?
It does if you convey the fact that something is already in a certain location. E.G

Под столом - under the table

But

If you convey the fact that something is not in a certain location yet but is being moved there or is going to be there you need the accusative case

под стол - is not under the table yet but where it should be

Положи это под стол - Put it under the table
Нашел это под столом - found it under the table

I hope this helps