82. No sooner ...than 

It is wrong to use when instead of than in these sentences. If no sooner begins the sentence, the auxiliary did or had must come immediately after it.

 • Incorrect: No sooner had she read the telegram when she fainted. 

• Correct: No sooner had she read the telegram than she fainted. 

• Incorrect: No sooner I heard the shot than I rushed to the spot. 

• Correct: No sooner did I hear the shot than I rushed to the spot.