1·The plural of 'child' is 'children'.
child一词的复数形式是children。
—— 《牛津词典》
2·'They are' is the third person plural of the verb 'to be'.
they are是动词to be的第三人称复数形式。
—— 《牛津词典》
3·That option is unavailable when the plural is always masculine or feminine in other languages.
在其他语言中，当复数总是阳性或阴性时，就没有这种选择了。
4·It always takes the third person singular form of the verb even though it's always plural in English.
它总是使用动词第三人称单数的形式，尽管在英语中它的动词总是复数。
5·It always take the third person singular form of the verb even though it's always plural in English.
它总是使用动词第三人称单数的形式，尽管在英语中“我们”的动词总是复数。