其

Third-person reference acting as:

1. Possessive: "his," "her," "its," or "their." It lacks gender and number distinctions and can be used indefinitely to mean a generic "one's."

2. Demonstrative: "that" or "those," typically functioning anaphorically to refer back to a previously mentioned object or concept.

Modal particle: Used to signal conjecture, uncertainty, or a rhetorical question (e.g., "Could it be that...?" or "I wonder if..."), shifting the sentence from an assertion to a possibility.

• Vs. 之 (zhī): While both indicate relationships between nouns, 之 is a general relational particle ("of"), whereas 其 specifically carries third-person or demonstrative weight.
• Relation to 渠 (qú): Historically and phonetically linked; in some early texts, 渠 serves as a direct third-person pronoun ("he/him").

The distinction between the possessive ("its [X]") and the demonstrative ("[that] X") can be fluid, as both point toward a third party or object. Exercise caution with modal usage: mistaking a modal 其 for a possessive will fundamentally alter the mood and meaning of the passage.