Select the correct sentence structure:

Correct sentence: No sooner did the bird see the worm than it flew away with it.

Key grammar points:

• After 'No sooner' use subject–auxiliary inversion: auxiliary (did) + base verb (see).

• Use 'than' to link the two clauses (not 'but' or 'when').

• Make sure tense agreement is correct: the first clause shows past via 'did', so the second clause should use the past form 'flew', not present 'flies'.

• Do not combine past markers (e.g., 'did had seen' is incorrect); use either 'did' + base verb or past perfect without 'did'.

Common mistakes and quick corrections:

• The sentence 'No sooner did the bird see the worm but it fly away with it.' is wrong because 'but' should be 'than' and 'fly' should be the past form 'flew'.

• The sentence 'No sooner did the bird had seen the worm it flies away with it.' is wrong because 'did had seen' doubles past marking (use 'did' + 'see'), it's missing 'than', and the second clause should be past ('flew'), not present ('flies').

• The sentence 'No sooner did the bird saw the worm when it flew away with it.' is wrong because 'saw' should be the base form 'see' after 'did', and the connector should be 'than' rather than 'when'.