不過讀到 Luke Prodromou 這位 Grammar and Vocabulary for FCE(Longman)及 Star 教科書系列(Macmillan)作者的下面這段敘述:「"It's raining cats and dogs." is one of the expressions least used by native speakers. In fact, it is notorious in applied linguistics circle as the epitome of the inappropriate use of idioms by non-native speakers.」英文老師或學生一定會張口結舌,不敢相信這是英語世界真實的描述,沒想到台灣學生朗朗上口的 It's raining dogs and cats. 在英美語世界裡卻沒有幾個人愛使用!