Answer:
If I visited Athens last year, I phoned you.
If you started coming to the course earlier, you could pass the exam.
If I hadn't been so shy at the party last Saturday, I might've made more friends.
If you hadn't spent so much money, I wouldn't be angry.
She could've gotten promoted last year if she hadn't argued with the boss.
He wouldn't get the job if he didn't wear a tie.