Try to get the rule by reading these examples

The dog barks: It is a barking dog
The dog barked: It was a barking dog
The dog frightens the cat: It is a frightening dog.
The dog frightened the cat: It was a frightening dog.
The problem confuses the students:It is a confusing problem.
The students are confused by the problem:They are confused students.
The story amused the children: It was an amusing story.
The children were amused by the story: They were amused children.
The class bores the students: It is a boring class.
The students are bored by the class:They are bored students
The traffic annoys me: The traffic is annoying:I am annoyed by the traffic
This situation worries me:This situation is worrying: I am worried about this situation.
Your attitude surprises me: your attitude is surprising:I am surprised with your attitude.
Your classes bore me: your classes are boring: I am bored by your classes.
Spiders scare me: they are scaring:I am easily scared by spiders
You disappointed us. Your behavior is disappointing:I am disappointed at you.
English interests me. It is an interesting language.I am very interested in English
New York excites me.It is an exciting city. I am excited by New york