YOU SAID:
ill call you when the parties over
INTO JAPANESE
パーティーが終わったときにあなたに電話する
BACK INTO ENGLISH
I will call you when the party is over
INTO JAPANESE
パーティーが終わったときに私はあなたに電話します
BACK INTO ENGLISH
I will call you when the party is over
That didn't even make that much sense in English.