YOU SAID:
don't you remember when i told you yesterday
INTO JAPANESE
昨日言ったとき覚えてないの?
BACK INTO ENGLISH
Don't you remember when you said yesterday?
INTO JAPANESE
昨日言ったときのこと覚えてない?
BACK INTO ENGLISH
Don't you remember when you said yesterday?
That didn't even make that much sense in English.