YOU SAID:
my friends don't have a rock this big
INTO JAPANESE
私の友人は、この大きな岩を持っていません。
BACK INTO ENGLISH
A friend of mine has no large rocks.
INTO JAPANESE
私の友人は、大きな岩を持ちません。
BACK INTO ENGLISH
A friend of mine has no large rocks.
That didn't even make that much sense in English.