the trees and their wood
hello, I was repeating Nature today and translated "the trees and their wood" as (sorry I don't have the greek keyboard installed in this computer)
"ta dentra kai ta ksula tous"
which was considered wrong, the correct form written as "to ksulo", in singular form. I'm not sure why. Is "ksulo" a word that is considered to be in singular and plural forms at the same time, like "wood" is in English?
Well, in some cases, ξύλο is indeed sometimes considered a plural form, for example
This table is made out of wood - Αυτό το τραπέζι είναι φτιαγμένο από ξύλο.
The table could be made out of multiple pieces of wood, but you still use wood instead of woods, because you want to actually indicate the material.
Maybe this is why ξύλα was rejected, because τα δέντρα και το ξύλο τους had the context of "the tress and the material that's made out of them". ^.^
Another note here: The use of plural is because the trees are also in plural ! For example when you want to talk about the wood coming from a certain tree you will say το δέντρο και το ξύλο του, if you want to talk about them all together it's τα δέντρα και τα ξύλα τους. Hope that also helps ;)