1) The students were very tired / tiring. 2) Teachers find it annoyed/annoying when students are late for class. 3) His parents are usually worried / worrying when he's late. 4) I heard a very frightened / frightening story. 5) Bermet was surprised / surprising to find a letter on her table. 6) The children were terrified/ terrifying when they heard a strange noise downstairs. 7) Horse riding can be an excited/exciting experience. 8) The boy was disappointed /disappointing by the test result. 9) When learning a new foreign language, grammar rules can be confused/confusing.​