YOU SAID:

This was the last time you ever saw your grandmother

INTO JAPANESE

あなたの祖母に会ったのはこれが最後だった

BACK INTO ENGLISH

This was the last time I saw your grandmother.

INTO JAPANESE

私があなたの祖母に会ったのはこれが最後でした。

BACK INTO ENGLISH

This was the last time I saw your grandmother.