Step 1: Understanding the Rule for 'No sooner':
Similar to “Hardly,” the introductory phrase “No sooner” requires grammatical inversion (placing the auxiliary verb before the subject) to express immediate chronological succession. Step 2: Structuring the Clauses:
The adverb “No sooner” is correlative and must be paired with “than” to connect the subsequent event. The template is: No sooner + auxiliary verb (had) + subject + past participle (started) + than + simple past clause. Step 3: Assembling the Sentence:
Following this rule produces: “No sooner had she started reading than she fell asleep.”