I have a good friend, she wants to teache her son native language. She doesn't know to read/write only speak that language. I told her he can join in the classes which my dd goes. Friend says no the timing doesn't work for her. Asking me to teach her son. I couldn't say No straight. (I'm still working on saying no to all) I told her if I have time , I will. Since my dd goes to class, I don't have to spend much time for it. Crux of to the issue is she wants to teach me on weekends, which is totally impossible for me. Weekdays she can't come as her son has classes. How do I say no ? In a polite way.