加ing ,ed 問題

「-ed 」同 「-ing 」點用?
「-ed 」同 「-ing 」是屬於participle adjectives。Verb (動詞)本身並不是形容詞，但它的participles可作形容詞。而加 -ing還是 -ed (past participle)作為形容詞主要不是看名詞是生物還是死物。
記實: Past participle 用來形容receiver of feeling (感受的一方，通常是人或動物):
The marathon runners were very tired.
感受的一方是馬拉松跑手，所以用past participle adjective。
Interested people can sign up for the 2-day class.
感受的一方是people，所以用past participle adjective。
記實: Present participle 用來形容cause of feeling (引起感受的原因，通常是死物)
That game of tennis was very tiring.
The game causes people to become tired. 用來形容game，所以用present participle - tiring。
Boring speakers put their attendees to sleep.
雖然speakers是人，但是speakers是令人產生沈悶的原因，所以一樣用present participle adjective。如果句子寫成 Bored speakers put their attendees to sleep，即表示內心感到纳悶的演講者令與會人仕昏昏欲睡，和Boring speakers put their attendees to sleep解釋有點不一樣。