After a negative adverb like No sooner at the beginning of a clause, inversion is required. The correct form is No sooner had she realized (auxiliary before subject), not No sooner she had realized. Hence part 1 is incorrect.
Choose the part of the sentence that has an error:
Held on 10 Jun 2023 · Verified 13 Jul 2026.
No sooner she had realized
her blunder than
she began
to take corrective measures
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