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Knowledge Base – Third Conditional

Multiple Choice · B2 Level

Choose the best answer for each item about the Third Conditional. Click Check Answer to see feedback, and submit to see your score.

Question 1
Question:
Which is the correct form of the Third Conditional?
Correct Answer: b) If + past perfect → would have + past participle.
Form: If + past perfect (had + V3) ⇄ would have + V3.
Question 2
Question:
Which sentence is correct?
Correct Answer: a) If I had studied harder, I would have passed the exam.
Third Conditional: past perfect in the if-clause + would have + V3 in the result.
Question 3
Question:
Which part is wrong in this sentence: If I would have called you, I would have told you the news.
Correct Answer: a) If I would have called you.
In standard English, do not use would in the if-clause: use past perfect → “If I had called you…”.
Question 4
Question:
Why is this sentence incorrect: If I studied harder, I would have passed yesterday?
Correct Answer: a) It mixes the second and third conditional.
Third conditional requires past perfect in the if-clause, not simple past.
Question 5
Question:
Which of these sentences is NOT a Third Conditional?
Correct Answer: c) If I studied more, I would pass the exam.
This is a Second Conditional (present unreal), not Third (past unreal).
Question 6
Question:
What is missing here: If I had studied, I would passed the test?
Correct Answer: b) “have”.
Result clause needs would have + V3 → “would have passed”.
Question 7
Question:
Which sentence shows the correct word order?
Correct Answer: b) I would have passed the test if I had studied.
Subject + would have + V3 is required in the main clause.
Question 8
Question:
Which sentence is correct?
Correct Answer: a) If she had worked harder, she would have succeeded.
Correct past unreal form in both clauses.
Question 9
Question:
Which sentence uses a modal correctly in the Third Conditional?
Correct Answer: a) If I had known, I could have helped you.
Modal perfect: could have + V3 matches past unreal condition.
Question 10
Question:
Which sentence is wrong and why? If I had studied, I passed the test.
Correct Answer: a) Wrong: “passed” should be “would have passed.”
Third Conditional result needs would have + V3, not past simple.
Question 11
Question:
Which of these expresses a real past event, not a Third Conditional?
Correct Answer: b) If I had arrived earlier, I saw her.
This mixes a real past result (past simple) with a conditional if-clause; it describes an actual event, not an unreal past consequence.
Question 12
Question:
What is the main meaning of the Third Conditional?
Correct Answer: b) Regrets or unreal situations in the past.
Third Conditional imagines different outcomes for past events.

Review the explanations above to reinforce the Third Conditional.