Thanks fuki, but I guess what I wanted to know is why "in their apple" could not be translated as onlarýn elmalarýnda, instead it´s onlarýn elmasýnda. Does that make sense? Is it some type of exception to the rules?
I´m not sure what you know, so I will go over some basics.
onlar means they
onlarýn is a possessýve noun (meaning their) and the following noun (apple - elma) must have a suffýx to show it is possessed.
onlarýn elmasý - their apple
onun elmasý - his/her apple
Now, when we add the suffix for in/on/at, in this case ´da´ we find for
onlarýn elmasý + buffer n (for the second suffix) + da = onlarýn elmasýnda (in their apple)
onun elmasý+ buffer n (for the second suffix) + da = onun elmasýnda (in his or her apple)
To quote fuki onlarýn elmalarýnda - in their apples
elmalar means apples, so the plural suffix (ler or lar) means that this is not one apple we are referring to.
(benim) elmam - my apple
(senin) elman - your apple
onun elmasý - his or her apple
(bizim) elmamýz - our apple
(sizin) elmanýz - your apple (formal or plural)
onlarýn elmasý - their apple
This is why our teacher always stated you must use either onun or onlarýn to avoid confusion.
So onlarýn elmalarýnda means ´in their apples´.
Thus including the possessing noun avoids ambiguity.
I forgot who originally posted this, (possibly marioninturkey), but it explains similar problems.
Evleri
e.g. evleri
could be
ev+leri = their house
or
evler+i = his/her houses
or
evler+i= houses (object of a noun)
or
evler+i= houses as a compound noun
It is usually obvious from the whole sentence:
Evlerini satacaklar = They are going to sell their house
(clue is the "lar" on the end of satacak: we are talking about "them")
Ahmet´in evleri çok = Ahmet has lots of houses (or Ahmet´s houses are many,
the clue is Ahmet´in: we are talking about Ahmet)
Evleri boyatacak mýsýnýz = Are you going to have the houses painted?
(clue is boyatmak which makes the noun take the objective ending)
Þelale Evleri´ne gideceðiz= We are going to Þelale Evleri
(Waterfall Houses= the name of a housing estate)
(clue is Evleri and the previous word have a capital letter that shows it is a proper noun)
I hope this also helps. 
Edited (11/7/2009) by Henry
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