Today, I went to bookstore to buy the English reference.
When I browsed and skimmed a certain book, the person who was Asian foreigner next to me asked me “Could you please read this author in English”.
As the book’s author that he pick up was written in Japanese katakana, I refer to the end of book and taught the author in English.
Afterwards, as he asked me what book is the best to learn in English, I and he discussed what book he wanted to buy.
After I explain the types of English reference including usage and I recommend some books.
Finally, he expressed gratitude to me and I said “You’re welcome”. Glad I could be of some help.