He speaks improperly with a woman, with the excuse that he is teaching her

No File Exists
Check below answers in case you are looking for other related questions:
His friend got to know a woman; can he call her to ask her to keep away from him?
Men and women talking to one another on the internet within the limits of good manners

No File Exists
Related Answers:
Etiquette of talking to women
Muslim women giving talks in gatherings where non-mahram men are present
Ruling on a woman talking to the tailor
His friend got to know a woman; can he call her to ask her to keep away from him?
Men and women talking to one another on the internet within the limits of good manners

Recommended answers for you:
Can the Prophet (peace and blessings of Allaah be upon him) hear those who call upon him when he is in his grave?
Is man’s fate pre-destined or does he have freedom of will?
More Women in Hell Than Men?
What is the ruling on offering congratulations on Friday?
Accepting a gift from a kaafir on the day of his festival