The document discusses the 3rd conditional, which is used to talk about hypothetical situations in the past that did not actually happen. It has a structure of "if + subject + past perfect" for the condition, followed by "subject + would + have + past participle" for the result. Examples given are "If she had been there, I would have seen her" and "If we had more time, we would have visited pompeii."

1. 3er conditional

2. Uses
 It is used to talk about situations that have not really taken place
 Hypothesis
 also to talk about something we regret
 imagine situations that could have happened differently

3. Structure and examples
Condition
If + subject + past perfect,
Structure of 3er conditional
If + subject + verb in past perfect + complement, subject +
would + have + verb in past participle + complement
Resultado
Subject + would + have + past participle

4. Examples
Example:
 If she had been there, I would have seen her
 If we had more time, we would have visited pompeii