YOU SAID:
i am bored in a class
INTO JAPANESE
私はクラスに退屈しています
BACK INTO ENGLISH
I am bored to class
INTO JAPANESE
私は授業に退屈しています
BACK INTO ENGLISH
I'm bored in class
INTO JAPANESE
私は授業に退屈しています
BACK INTO ENGLISH
I'm bored in class
You've done this before, haven't you.