YOU SAID:

I ain't never seen two pretty best friends, one of them is always ugly

INTO JAPANESE

私は2人のかなり親友を見たことがありません、そのうちの1人はいつも醜いです

BACK INTO ENGLISH

I've never seen two pretty best friends, one of which is always ugly

INTO JAPANESE

私は2人のかなり親友を見たことがありません。そのうちの1人はいつも醜いです

BACK INTO ENGLISH

I have never seen two pretty best friends. One of them is always ugly

INTO JAPANESE

私は2人のかなりの親友を見たことがありません。それらの1つは常に醜いです

BACK INTO ENGLISH

I have never seen two pretty best friends. One of them is always ugly