cast 是动词和名词,作为动词的话,过去分词形式都是cast。cast down,使沮丧;使伤心;使忧愁 If someone is cast down by something, they are sad or worried because of it. 是要用被动语态的。所以小姑娘沮丧是she was cast down.我会这样记忆 cast down是动词短语,不过有时在be动词后面,可以做形容词短语修饰,像是表状态之类的。