plaguy

grammar · medium

易错句子Mosquitoes were a real plaguy last summer.

正确表达Mosquitoes were a real nuisance last summer.

plaguy 是形容词，只能作定语修饰名词（如 a plaguy fly），不能加冠词 a 当名词用，也不能充当主语或表语的核心。要表达“令人烦恼的事物”，须换成名词 nuisance，句子成分才完整。

grammar · medium

易错句子The campsite was plaguy by mosquitoes all night.

正确表达The campsite was plagued by mosquitoes all night.

表示“被……侵扰”要用动词 plague 的过去分词 plagued，构成 be plagued by 这一被动结构；plaguy 是形容词“令人烦恼的”，不能带 by 短语，也没有被动用法。