不定代词，是英语语法术语，在句中可以作主语、宾语、表语、定语和状语。不定代词是不指明代替任何特定名词或形容词的代词。
不定代词作主语，总与动词的单数形式搭配。
When an indefinite pronoun is the subject, it always takes a singular verb.
但指代不定代词的需用复数代词，物主代词及复数动词。
When you refer back to indefinite pronouns, you use plural pronouns or possessives, and a plural verb.
当我们不知道或没有必要说明所谈论的人是谁或是什么事物时，我们就用不定代词来指代人或物。
We use indefinite pronouns to refer to people and things when we do not know or do not need to mention who or what we are talking about.
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