: Which sentence uses correct inversion for emphasis?

The correct sentence is "Never have I seen such a sight." This sentence correctly employs inversion for emphasis. When a negative adverbial phrase, such as "Never," "Seldom," "Rarely," or "Hardly," is placed at the beginning of a sentence for dramatic effect or emphasis, the auxiliary verb (e.g., have, do, be, can, will) must come before the subject. This structure creates a more formal or striking tone.

• "Never I have seen such a sight" is incorrect because it places the subject "I" before the auxiliary verb "have," failing to apply the inversion rule.
• "I never have seen such a sight" and "I have never seen such a sight" are grammatically correct sentences but do not use inversion. The adverb "never" is in its usual position, not at the beginning to trigger emphasis.

Therefore, only the first option correctly demonstrates the grammatical rule for emphatic inversion.