Read the following sentence to find out whether there is an error in any part. No sentence has more than one error. If you feel there is no error in a sentence, choose ‘No error’.
No sooner had he returned than he was off again.

Correct option is D

Option (d) is correct – No error.
Explanation: This sentence follows the standard inversion structure used after "No sooner." It is also correctly paired with “than.”
Grammatical rule used:
�� After "No sooner", use auxiliary verb + subject + V3, and pair it with “than.”
Example: No sooner had she arrived than it started to rain.
�� Information Booster: Don’t confuse "than" with "when" – "No sooner" is always followed by "than."