YOU SAID:
I was doing Chinese In English
INTO JAPANESE
私は英語で中国語をしていました
BACK INTO ENGLISH
I was Chinese in English
INTO JAPANESE
私は英語で中国語でした
BACK INTO ENGLISH
I was in English and Chinese
INTO JAPANESE
私は英語と中国語でした
BACK INTO ENGLISH
I was in English and Chinese
That didn't even make that much sense in English.