YOU SAID:
Teacher is not a leper.
INTO JAPANESE
教師ははしゃべり人ではありません。
BACK INTO ENGLISH
The teacher is not a talkative.
INTO JAPANESE
先生はおしゃべりではありません。
BACK INTO ENGLISH
The teacher is not chatting.
INTO JAPANESE
先生はチャットしていません。
BACK INTO ENGLISH
The teacher is not chatting.
That didn't even make that much sense in English.