YOU SAID:
Do they know it's christmas?
INTO JAPANESE
彼らはそれがクリスマスだと知っていますか?
BACK INTO ENGLISH
Do they know it is Christmas?
INTO JAPANESE
彼らはそれがクリスマスであることを知っていますか?
BACK INTO ENGLISH
Do they know it is Christmas?
Okay, I get it, you like Translation Party.