-ed [versus] - ing: excited/exciting etc.
We have a lot of words to talk about feelings that end in "-ed" and "-ing". A few examples:
- excited & exciting
- bored & boring
- interested & interesting
- "-ed" describes the person who has the feeling.
- "-ing" describes what causes the feeling.
- The football game was very exciting. I was really excited.
For Chinese students, here's a short fun video explaining this issue, from the BBC's Chingles series. (There's also a PDF with transcript & a short exercise.)