YOU SAID:
I was taking a bath when a bear appear
INTO JAPANESE
クマが現れたときに風呂に入っていた
BACK INTO ENGLISH
I was taking a bath when the bear appeared
INTO JAPANESE
クマが現れたとき、私は風呂に入っていた
BACK INTO ENGLISH
I was taking a bath when the bear appeared
Come on, you can do better than that.