All you had to know is the word "Dog" and the plural morpheme 's' and you could put them together to create a word.

你只需知道"狗"这个词以,及复数语素'们',你可以将它们组合在一起来创造出一个词

耶鲁公开课 - 心理学导论课程节选

There's not really plural form of verbs in Korean, so then again it's also difficult.

韩语中真地没有动词复数形式，所以这一点也比较难。

韩国人经常犯的失误 - SpeakingMax英语口语达人

Notice, it's Prisoners, plural.

注意一下,囚徒是复数形式

耶鲁公开课 - 博弈论课程节选

many an individual in the poem who is referred to as a Basileus, the plural is Basileis, which is normally and regularly translated as king, and that's right.

在史诗中有很多人物被称为,巴赛勒斯,复数形式是"Basileis",通常翻译成君主

耶鲁公开课 - 古希腊历史简介课程节选