16Hit1600
Standard English ConventionsHardPast conditional with 'would have'

Standard English Conventions practice question

If the alarm had sounded, the guards ____ the fire much earlier.

Which choice completes the text so that it conforms to the conventions of Standard English?

  1. A. would have noticedCorrect
  2. B. would notice
  3. C. will notice
  4. D. had noticed

Answer: A. would have noticed

The 'if' clause uses the past perfect ('had sounded'), describing something that didn't happen. The result of such an unreal past condition takes 'would have' + participle.

Why the other answers are wrong

B. would notice
'would notice' pairs with a present unreal condition ('if the alarm sounded'), not a past one.
C. will notice
'will notice' is a real future, but the alarm did not sound.
D. had noticed
'had noticed' repeats the past perfect in the result clause, which needs 'would have'.

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