以-ing結尾的adj：表示"讓人覺得"。
這個案子讓人覺得挫敗。
(?) This project is frustrating.
(?) This project is frustrated.
這部電影很無聊。
(?) This film is very boring.
(?) This film is very bored.
遲到是最煩人的工作習慣。
(?) Lateness is the most annoying work habit.
(?) Lateness is the most annoyed work habit.
以-ed結尾的adj：敘述"我覺得"。
我感到很挫敗。
(?) I am very frustrated.
(?) I am very frustrating.
因此形容一個人時，要先分清你是在形容這個人的個人感情(-ed)，還是這個人給別人的感覺(-ing)，可別再不小心鬧笑話了。
John was disappointing. John很掃興。->讓別人很失望。
John was disappointed. John很沮喪。->他自己很失望。
