📝 Created by: El Arby Ameur | 📅 August 2026 | 🌐 lesson.tn
📖 Third Conditional Rules: If + Past Perfect, Would Have + Past Participle
Level: B2 | Focus: Form, Usage, Rules
GrammarConditionalsthird conditionalrulesgrammar
1. The Formula
If + Past Perfect (had + past participle), Would Have + Past Participle
Use past perfect in the if clause (imaginary past condition) and would have + past participle in the result clause!
2. When to Use Third Conditional
Expressing Regret: If I had studied harder, I would have passed.
Missed Opportunities: If she had applied, she could have gotten the job.
Criticism: If you had listened, you wouldn't have failed.
Speculating About the Past: If the Titanic had not sunk, it would have arrived safely.
3. Contractions
• had = 'd (I'd, she'd, they'd)
• would have = would've
• would not have = wouldn't have
Example: If I'd known, I would've helped.
4. Word Order
• If + past perfect, would have + past participle.
• Would have + past participle + if + past perfect.
You can put the "if clause" first or second. The meaning is the same!
⚠️ Important Rules:
1. NEVER use "would have" in the if clause!
2. Use past perfect (had + past participle) in the if clause
3. Use "would have + past participle" in the result clause
4. The Third Conditional refers to an IMAGINARY PAST (cannot be changed)