Learn Turkish: Kitap masanın üstünde. - The book is on top of the table.

In Turkish, spatial relationships like "on top of" or "under" are built using possessive phrases. You are literally saying "the table's top". To do this, masa (table) takes the genitive (possessive) ending -nın to become masanın (the table's / of the table).

How exactly is üstünde formed from üst (top)?

First, we add the 3rd person possessive ending -ü to mean "its" (referring to the table), making üstü. Next, we need the locative ending -de (in/on/at) to say where the book is. In Turkish, whenever you attach a case ending like -de to a 3rd person possessive ending, you must use the buffer letter -n- between them. So the breakdown is: üst + -ü + -n- + -de.

Could I just say Kitap masada instead?

Yes! Both translates to "The book is on the table." Kitap masada uses the simple locative case (on/at the table). Masanın üstünde is more specific, literally meaning "on top of the table." This structure is very useful when you need to be precise about whether an object is on, under, or next to something else.

Where is the word for "is" in this sentence?