A plural marriage is forbidden by many countries.

一夫多妻, 一妻多夫制被许多国家禁止。

And Kwaio has not just singular and plural, but dual and paucal too.

瓜依沃语中不光有单数和数，还有双数和若干的概念。

Here you should use plural pronoun.

这里你应该用数代词。

The “old things” – neuter plural things – an expression of the “unredeemed world,” existing in sin and misery.

「旧事」指﹕未被救赎的世界，于罪与痛苦中生存。