udent: I can't understand it. What's the grammar rule ?
Teacher: You are treating these words as verbs, but they are adjectives in these sentences. They are describing the feelings of the subject. A few simple examples: I am annoyed. She is excited to go on vacation. The dog was tired. Marathons are exhausting.
Think of emoticons (from skype) when you are trying to decide if a word is an adjective… I am bored.
Adjectives that are really Participles, verb forms with -ing and -ed endings, can be troublesome for some students. It is one thing to be a frightened child; it is an altogether different matter to be a frightening child. Do you want to go up to your professor after class and say that you are confused or that you are confusing? Generally, the -ed ending means that the noun so described (“you”) has apassive relationship with something — something (the subject matter, the presentation) has bewildered you and you are confused. The -ing ending means that the noun described has a more active role — you are not making any sense so you are confusing (to others, including your professor).