YOU SAID:
I don't really understand where water comes from
INTO JAPANESE
私は水がどこから来たのか本当に理解していない
BACK INTO ENGLISH
I don't really understand where the water comes from.
INTO JAPANESE
私は水がどこから来たのか本当に理解していません。
BACK INTO ENGLISH
I don't really understand where the water comes from.
That didn't even make that much sense in English.