YOU SAID:
hi i just had pizza do you know what pizza is?
INTO JAPANESE
こんにちは私はピザを持っていたあなたはピザが何であるか知っていますか?
BACK INTO ENGLISH
Hello Do I know you had a pizza pizza is?
INTO JAPANESE
こんにちは、私はあなたがピザピザを持っていたことを知っていますか?
BACK INTO ENGLISH
Hello, I know that you had a Pizapiza?
INTO JAPANESE
こんにちは、私はあなたがPizapizaを持っていたことを知っていますか?
BACK INTO ENGLISH
Hello, I know that you had a Pizapiza?
That didn't even make that much sense in English.