If you want to know how to talk to and appreciate a teacher, read this excellent article.
"The best way to thank a teacher is not to treat what they do as a good deed, but to treat it as a highly professional career path that they love to follow, and for which they work hard to be successful."
From "Appreciate Teachers by Understanding What They Do" by Mary Beth Hertz.
"The next time you talk to a teacher, ask them why they got into teaching. Ask them about their favorite reading strategies, or a recent project their students worked on that they are really proud of. Ask them for advice for your own child's education. Ask them for their opinion on the Common Core Standards, or for their favorite learning website or tool in the classroom. If they have some great suggestions, ask them a favor -- ask them to send those resources to you by email, or write them down on the spot."