Here's a great list I found some time ago.
"It's Boring" can mean:
- It's too easy.
- I'm confused, but I don't know how to ask for help.
- I don't like to (read, write, perform, etc).
- It's too difficult. I don't know where to begin.
- I'm not interested in this (content, course, etc).
- Everyone says this, and I want to fit in.
- It's not deep, complex, broad enough to tap my interest.
- I get A's without even trying. What's the point?
- I'd rather do _____________ .
- Just how many times do I have to show I know this work before you believe me?
- Something in my personal life is more important right now.
- I don't like the teacher because�
- I read the book already. What else can I read?
- I don't want to talk about this.
