Dear John,
I'm back in Vietnam now. I'm so sorry for not writing to you before. I was very busy with work and school. My family is fine. My mother is still in hospital. She has recovered from her illness but she needs some more treatment.
I want to thank you for everything you have done for me while I was in England. I learned a lot from your course, especially about business. I think my English has improved a lot since then and I have got many friends here who speak English well and help me with my homework.

I hope you will come over to Vietnam sometime soon because there are lots of beautiful places that we can visit together.
Best wishes,