1. We plant trees on the hills year after yearand they are growing taller year by year. 我們年年在山上種樹,它們正逐年長高。
【說明】year after year 強調每年(動作的)重複, year by year強調(動作)逐年發生變化。
2. Last time you left the umbrella at home.Today, you mustn’t forget it any more.
【說明】leave和forget均有「遺忘」的意思。一般說來,若只是表示忘記某物,但不具體說明把某物忘在什麼地方,則用forget;反之,若要具體說明把某物忘在什麼地方,則用leave。