YOU SAID:

i ain't never seen two pretty best friends, its always one of them gotta be ugly

INTO JAPANESE

私は2人のかわいい親友を見たことがない、その常にそれらの1つは醜い必要があります

BACK INTO ENGLISH

I've never seen two cute best friends, its always one of them must be ugly

INTO JAPANESE

私は2人のかわいい親友を見たことがない、その常にそれらの1つは醜いに違いない

BACK INTO ENGLISH

I've never seen two cute best friends, its always one of them must be ugly