if i came home later my mother would be angry.
if he had known my address we would have visited me yesterday.
i was not well prepared for the examination. I wish I had worked harder.
if i had seen you yesterday I would have told you about it.
if i had known that you needed my help I would have helped you.
if i were in your place I would buy another model of the mobile phone.
if i had a computer I would write the report faster.