YOU SAID:
What would you do if he said yes would go but ok was if
INTO JAPANESE
彼が「はい」と言ったらどうしますか?
BACK INTO ENGLISH
What would you do if he said yes?
INTO JAPANESE
彼がイエスと言ったらどうしますか?
BACK INTO ENGLISH
What would you do if he said yes?
That didn't even make that much sense in English.