YOU SAID:

Why hello, it must have been months since the last time i've seen you

INTO JAPANESE

こんにちは、最後に会ったのは何ヶ月も前だったはずです

BACK INTO ENGLISH

Hi, last time we met must have been months ago

INTO JAPANESE

こんにちは、最後に会ったのは数か月前だったはずです

BACK INTO ENGLISH

Hi, last time we met must have been a few months ago

INTO JAPANESE

こんにちは、最後に会ったのは数か月前だったはずです

BACK INTO ENGLISH

Hi, last time we met must have been a few months ago