Paraphrasing 3rd conditional
He does not know English, so he can not get a better job.
If he knew English, he could get a better job.
She did not go to school yesterday, so she did not meet her friends there.
If she had gone to school yesterday, she would have met her friend there.
It was cloudy yesterday, so we did not sunbath.
If it had not been cloudy yesterday, we would have sunbathed.