YOU SAID:
This is halloween! This is halloween!
INTO JAPANESE
今日はハロウィーンです!今日はハロウィーンです!
BACK INTO ENGLISH
It's Halloween today! It's Halloween today!
INTO JAPANESE
今日はハロウィンですね!今日はハロウィンですね!
BACK INTO ENGLISH
It's Halloween today! It's Halloween today!
That didn't even make that much sense in English.