The third conditional states what would have resulted if something different had happened in the past.
If you had been to Africa, you would have talked about its beauty
If I’d received a ticket, I would have paid for it
If they’d won the game, I would have been very annoyed
The form of the third conditional is past perfect, then, usually, ‘would’ + present perfect
In number 1, if the person had received a ticket (which suggests they didn’t), then they would have paid for the ticket. The event never happened (they didn’t buy the ticket) and so, along with other third conditional statements, the result was they would have done XXX (which in this instance, they would have paid for it).
There are instances where we can use continuous forms of the verb.
If they hadn’t walked to school, they wouldn’t have been arriving now.
If you’d been rude I wouldn’t have liked you
If John had watched the video he would have been crying now
If we’d won the game we could have played in the final
If she’d been lied to she might not have cried
In some cases, ‘would’ can be exchanged for other modal verbs which may describe the result more accurately