YOU SAID:
I know the dwarves can be piggy headed
INTO JAPANESE
ドワーフがうぬぼれることがあるのは知っています
BACK INTO ENGLISH
I know dwarves can be vain.
INTO JAPANESE
ドワーフが虚栄心になれることは知っています。
BACK INTO ENGLISH
I know dwarves can be vain.
That didn't even make that much sense in English.