乃

• Sequential or temporal transition: "then."
• Copula or identification: "namely," "is."
• Assertive emphasis: "indeed," "really."
• Concessive or ironic realization: "after all," "as it turned out."

• Sequential/Conditional: Marks a sequence of events, often suggesting a necessary prerequisite or logical consequence ("only then").
• Copula: Links two nouns to identify A as B.
• Adverbial: Modifies a predicate or statement to reinforce truth, nature, or inevitability.

• Versus 然後 (rán hòu): 乃 is more syntactically integrated and typically indicates a tighter causal or conditional bond between action and result.
• Versus 是 (shì): While both can function as copulas, 乃 often implies revelation, correction, or an unexpected identity ("A is actually B") rather than neutral identification.

• Variants: U+8FFA and U+5EFC are script evolution variants (seal to clerical) with no shift in meaning.

// Historical readings: Fanqie 奴亥; Tang-period //nəǐ*.

To determine the specific function of 乃 in a passage, evaluate its syntactic role:

1. Linking two events → Sequence or Condition ("only then").

2. Linking two nouns → Identity or Revelation ("is actually / namely").

3. Modifying a predicate/statement → Emphasis or Irony ("indeed / as it turns out").