blackguard

grammar · medium

易错句子Tom is blackguard; he cheated his friends.

正确表达Tom is a blackguard; he cheated his friends.

blackguard 是可数名词，指某人是“一个”恶棍时必须用不定冠词 a；汉语名词前没有冠词，所以学习者常漏掉。可数名词单数不能单独裸用。

grammar · medium

易错句子Don't trust that black guard.

正确表达Don't trust that blackguard.

blackguard 是一个独立的单词，不是 black 与 guard 组成的词组。拆成两个词会使它被理解为“穿黑衣的警卫”，既改变了词义，也不符合标准拼写。

grammar · medium

易错句子The blackguard at the door asked to see my pass.

正确表达The guard at the door asked to see my pass.

blackguard 意为“道德败坏的人、恶棍”，与“警卫、保安”无关。看到词中 guard 就套用“警卫”之义属于词义混淆；表示门卫、保安只能用 guard。