YOU SAID:
A door isn't a door if it's ajar
INTO JAPANESE
もしそれがジャーならドアはドアではない
BACK INTO ENGLISH
If it is a jar the door is not a door
INTO JAPANESE
それが瓶の場合、ドアはドアではありません
BACK INTO ENGLISH
If it is a bottle, the door is not a door
INTO JAPANESE
それが瓶であれば、ドアはドアではありません
BACK INTO ENGLISH
If it is a bottle, the door is not a door
That didn't even make that much sense in English.