Third Conditional

Used to talk about imaginary or unreal situations in the past.
It describes things that did not happen, and their imagined result.

Structure

Affirmative:

If + subject + had + past participle, subject + would have + past participle.

Example:
"If Ruby had studied harder, she would have passed her exam."

Negative:

If + subject + had not (hadn’t) + past participle, subject + would not have + past participle.

Example:
"If she hadn’t been late, she would have caught the bus."

Interrogative:

Would + subject + have + past participle + if + subject + had + past participle?

Example:
"Would you have gone to the party if you had known?"

You can change the order:

Subject + would have + past participle + if + subject + had + past participle.

Example:
"Ruby would have passed her exam if she had studied harder."

When to use it:

Imaginary Past Situations

We use the third conditional to talk about past situations that were different from reality.

Example:
"If I had woken up earlier, I would have arrived on time."
(But I didn’t wake up earlier, so I arrived late.)

Regrets

Often used to express regret about the past.

Example:
"If I had studied more, I would have gotten better grades."

Criticism

Sometimes used to criticize past actions.

Example:
"If you had listened to me, you wouldn’t have made that mistake."

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Practice exercises