So, kaybedilmek is fine and I am going to add it as an alternative. However, keep in mind that it is really rare that you would ever say it (only when you really want to stress that this lost object was lost by a person). It is kind of strange sounding but is grammatically perfect..
It seems right to me.
The only thing I can think of is that the subject should come first. But the course has already shown the flexibility of this layout.
May be wrong but I always understood that Kaybolmak was used for living things while kaybetmek was used for non-living things.. I use Kabetmek as it seems not to be living, marked as wrong Can someone give me an explanation
I think it has nothing to do with living or non-living things. Kaybetmek is used when you loose anything (you can loose a thing, an animal, a person). Kaybolmak is used when something get lost.
Example: I lost my wallet (> kaybetmek) but My wallet get lost (> kaybolmak)