1. What is the plural of ´child´ ?
    “孩子”（一词）的复数形式是什么?

2. "Dogs" is a plural noun.
    Dogs 是复数名词。

3. If today I use a singular personal pronoun to refer to myself, next week I will use the plural form.
    如果今天我提到自己时使用的是单数人称代词，那么下星期我就会使用复数形式。