"Tamten sýr nemám ráda."

Translation: I do not like that cheese.

[Shathu_Entayla]

I really dont understand the difference between "ten", "tamten", and "tento".

[JanLyko]

"Tamten" and "tento" are easy:

tamten = that

tento / tenhle = this

"Ten" is a bit tricky. It is usually translated as "that" or simple "the".