YOU SAID:
I have Chinese class first period.
INTO JAPANESE
私は中国語のクラスの最初の期間があります。
BACK INTO ENGLISH
I have the first period of Chinese class.
INTO JAPANESE
私は中国のクラスの最初の期間があります。
BACK INTO ENGLISH
I have the first period of Chinese class.
That didn't even make that much sense in English.