代词和限定词 - 虚拟代词和非人称代词

used in a sentence to fulfil a grammatical function without a clear antecedent for it to refer to

它

used to serve as a placeholder without referring to a specific noun

有

used to make general statements, express opinions, or provide advice without referring to specific individuals

一个

used to refer to people in a general, unspecified manner, or to discuss hypothetical situations or scenarios

他们

used to address people in general, rather than referring to any specific individual

你