I totally second that! Some teachers really go above and beyond and it's nice to acknowledge their effort. I remember Miss Lim, my secondary school chemistry teacher, who encouraged me to participate in the national chemistry competition and believed in me when I didn't think I could do it. The extra time she spent preparing us paid off, and that victory was a huge confidence booster for an unsure teenage girl!
It's these little things that teachers do which can make a world of difference, and I'm sure many of us appreciate it more than they know
It's the least we can say, to show our gratitude for their unseen efforts.