How you feel inside: “-ED” 
- disgusted
- confused
- bored
- excited
- frightened
- embarrassed
How you make others feel: “-ING”
- disgusting
- confusing
- boring
- exciting
- frightening
- embarrassing
Examples:
- disgusted & disgusting
I was disgusted by the food at my friend’s wedding. It was really bad.
The food at my best friend’s wedding was disgusting. It had a bad smell.
- confused & confusing
All students are confused. English grammar is hard to understand.
The teacher is confusing. The students can’t understand anything.
- bored & boring
The students are bored. The teacher is not funny at all.
The teacher is boring. No one likes his classes.
- excited & exciting
Elena was really excited about the party.
The party was exciting. Elena danced all night.
- frightened & frightening
The cat was frightened and ran away.
The dog was big and frightening. The cat got scared and wanted to hide.
- embarrassed & embarrassing
I was so embarrassed. I made so many mistakes and everyone laughed.
His behavior was embarrassing. His parents were very upset and promised to teach him a lesson.