If I had a secretary, my job would be easier.
If we hadn't taken a mobile phone, we wouldn't have been able to contact the police and they wouldn't have caught the criminals.
If I had known she was so ill, I would have visited her.
If we had more money, we would go skiing on holiday.
She would get better grades if she worked harder at school.
If we sold our house, we would lose a lot of money, so we decided not to move.