The oracle-bone form of 其 shows a flat-bottomed woven basket — a winnowing tray used to separate grain from chaff by tossing the contents into the wind. The tray's woven pattern is visible in the earliest inscriptions: a rectangular grid with splayed feet. The modern character has compressed into abstraction — 一 across the top, 甘 (sweet; mouth) at center, 八 spreading at the bottom — but the basket shape explains why 箕 jī (a dust-pan-style basket) uses 其 as its phonetic component. The two characters share origin; one kept the basket meaning, the other was recruited for grammar.

By the Shang dynasty, 其 had already been commandeered as a third-person pronoun and demonstrative, leaving the basket sense to the bamboo-radical variant 箕. This kind of phonetic borrowing — a concrete noun pressed into service as an abstract function word — is one of the mechanisms by which Classical Chinese built its grammatical toolkit without creating new characters from scratch.

In Classical Chinese (文言文 wényánwén), 其 carries considerable weight: it is the standard third-person possessive and attributive pronoun (his, her, its, their), a demonstrative (that, such), and — depending on context — a modal particle marking uncertainty or exhortation. The Analects alone uses 其 hundreds of times. Modern Mandarin has largely handed its conversational pronoun roles to 他的/她的/它的, but 其 remains essential in formal written Chinese, legal documents, classical quotation, and set phrases.

A handful of 其 compounds function less as vocabulary items and more as structural joints in formal Chinese prose. 尤其 yóuqí (especially; in particular), 极其 jíqí (extremely), 与其 yǔqí (rather than), and 任其 rèn qí (to let it; to leave things as they are) each use 其 to refer anaphorically to something already in view — "that," "its," the thing we are discussing. Mastering these is the difference between reading formal Chinese as a string of words and reading it as structured argument.

A farmer stands in the threshing yard at dusk, tossing grain skyward with a flat woven tray. The chaff lifts away on the wind; the heavy grain falls back. The tray — 其 — does not hold what matters. It only separates. This is 其 as a grammatical tool: it points, attributes, refers, connects — but the meaning lives in the noun it precedes, the context it links back to.

When Confucius wrote 知之者不如好之者，好之者不如乐之者 — "Those who know it are not as good as those who love it; those who love it are not as good as those who take joy in it" — the 之 in each clause does what 其 does: it holds the place of "it," that unstated thing you are learning or doing. 其 and 之 are the grammatical scaffolding that let classical Chinese prose build complex, referential argument without repeating nouns. Fluency in classical reading depends on tracking them.

The compound pattern follows the image: 其中 (within the tray), 其余 (what the tray doesn't catch), 其实 (what it actually weighs out to). Every compound lets 其 do its pointing work — "that thing over there" — while the second character names what matters.