Which of the following sentences correctly demonstrates negative inversion after "Scarcely"?

Answer and explanation

Correct answer: C. Scarcely had the lecture started when the alarm sounded.

  1. Step 1: Review the rules for negative adverbial inversion: when negative or restrictive adverbs such as Scarcely, Hardly, or Barely open a sentence, auxiliary inversion ("had + subject + past participle") is mandatory.
  2. Step 2: Verify the correlative time conjunction: Scarcely obligatorily pairs with when to introduce the subsequent event (unlike No sooner, which pairs with than). Thus: "Scarcely had the lecture started when the alarm sounded."
Answer
Scarcely had the lecture started when the alarm sounded.
Why not the others: "Scarcely the lecture had started..." fails to invert subject and auxiliary; "Scarcely did the lecture started than..." uses past form "started" after "did" and pairs with "than"; "Scarcely had the lecture started than..." incorrectly uses than instead of when.

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