How are third conditionals formed?

Third conditionals are formed like this:

If-clause (condition)Main clause (result)
If + past perfectwould + have + past participle
If I had won the lottery,I would have bought a BMW.
If she had gone to bed earlier,she wouldn't have been so tired for the exam.

Just as you may have noticed with the first and second conditionals, you can also swap the if-clause and the main clause around. If the if-clause comes in second place, you don't need a comma. Take a look at these examples:

He would have become a teacher if he had gone to university.
He would have been on time for the job interview if the bus hadn't been late.
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