The Third Conditional is a grammatical structure used to talk about hypothetical situations in the past that did not happen. It uses the structure "If + Subject + had + past participle verb" to describe the condition, followed by "Subject + would + have + past participle verb" to describe the possible result. Examples include "If I had bought a lottery ticket, I would have won!" and "I would have gone to the beach if it had rained yesterday."

1. Third Conditional

2. The Third Conditional is a
structure used for talking
about a condition in the past
that did not happen.
It is also like a dream, but
with no possibility of the
dream coming true.

3. If clause main clause
If I had bought a lottery ticket, I would have won!
If I had won the lottery, I would have had a million!
Main clause If clause
I would have gone to the beach if it had rained yesterday.
I would have been single now if I hadn’t met her.

4. Structure
If + condition
If + S + had + verb (past participle) + C
Result
S + would + have + verb (past participle) + C