It is a pleasure working with you. Your persistence has helped you achieve a lot and it is really inspiring.
You'd better listen to new words and sentences in EFL. Practice your pronunciation with the new words.
Thank you so much ma'am for helping your son. It's my pleasure to be his teacher. I believe your son will improve more with constant practice. He knows some English words but he can't say sentences on his own but with guidance he can do that so I hope to see him again here at 51talk so I could help him more.