YOU SAID:
watachi wa reifu desu.
INTO JAPANESE
watachi は reifu です。
BACK INTO ENGLISH
watachi is reifu.
INTO JAPANESE
watachi は、reifu です。
BACK INTO ENGLISH
watachi is a reifu.
INTO JAPANESE
watachi は、reifu です。
BACK INTO ENGLISH
watachi is a reifu.
That didn't even make that much sense in English.