For older children or adults:
I have used many different textbooks throughout the years. This is hands down my favorite series. It’s organized differently from the typical theme based chapter books. There are many sections and each section is only 1 page, front and back. On the front page a concept is introduced. This could be themed vocabulary, prepositional phrases or phrasal verbs, or a small grammar topic. The back page has exercises to test understanding.
The first page is a great jumping off point for me and my student to have a long discussion, using the new words and construction. The value I add as a native speaker is a chance for the student to practice their speaking and to ask in depth questions. After our lesson the exercises provide great practice for them to do at home. Each lesson is new and fresh, and the student can quickly see results.
My favorite first lesson is Everyday Problems. Here we learn how to say something is broken and all the things that can go wrong in a day. It’s a humanizing topic that makes for great ice-breaking conversation.
I use these books not just with my adult students but also my older children. The topics are interesting enough even for teenagers.