Conditional 2 If +Past Simple, Past Continuous would/could/ might+Verb1 E.g. If they had a car they could go there driving it. /unreal action-50%-50%/ Often called the "unreal" conditional because it is used for unreal - impossible or improbable - situations. This conditional provides an imaginary result for a given situation. NOTE! The verb 'to be', when used in the 2nd conditional, is always conjugated as 'were'. EXAMPLES: If he studied more, he would pass the exam. I would lower taxes if I were the President.
Conditional 3 If+ Past Perfect, would/could/might/ have+V3 E.g. If they hadn’t lost their money, they would have bought that. (unreal action-0%) Often referred to as the "past" conditional because it concerns only past situations with hypothetical results. Used to express a hypothetical result to a past given situation. If he had known that, he would have decided differently. Jane would have found a new job if she had stayed in London.