YOU SAID:

I was in my animal behavior class and

INTO JAPANESE

私は動物行動のクラスにいて、

BACK INTO ENGLISH

I was in an animal behavior class,

INTO JAPANESE

動物行動の授業にいたのですが、

BACK INTO ENGLISH

I was in animal behavior class.

INTO JAPANESE

私は動物行動のクラスにいました。

BACK INTO ENGLISH

I was in animal behavior class.