YOU SAID:

I ain't never seen two pretty best friends, one of them's always gotta be ugly.

INTO JAPANESE

私は2人のかなり親友を見たことがありません、彼らの1人はいつも醜い必要があります。

BACK INTO ENGLISH

I haven't seen two pretty best friends, one of them always has to be 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人はいつも醜い必要があります。

BACK INTO ENGLISH

I haven't seen two pretty best friends, one of which should always be 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人はいつも醜いはずです。

BACK INTO ENGLISH

I have never seen two pretty best friends. One of them should always be 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つは常に醜いはずです。

BACK INTO ENGLISH

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