2nd, 3rd & mixed conditionals
I missed the bus, so I was late for the job interview. But if....
If I hadn't missed the bus, I wouldn't have been late for the job interview.
Julia can't speak English; that's why she didn't understand what he said. But if.....
If Julia could speak English, she would have understood what he said.
Jack isn't well-qualified, so he can't find a good job. But if.....
If Jack was/were well-qualified, he could find a good job.