YOU SAID:
I've had all the coffee I can.
INTO JAPANESE
私は私ができるすべてのコーヒーを持っていた。
BACK INTO ENGLISH
I had all the coffee I could.
INTO JAPANESE
私は私ができるすべてのコーヒーを飲んだ。
BACK INTO ENGLISH
I drank all the coffee I could.
INTO JAPANESE
私は私ができるすべてのコーヒーを飲んだ。
BACK INTO ENGLISH
I drank all the coffee I could.
That didn't even make that much sense in English.