The past subjunctive has the same form as the past simple tense except in the case of the verb be. Traditionally, the past subjunctive form of be is were for all persons, including the first and third person singular.
if + past subjunctive | would + infinitive (simple or continuous)
The second conditional can describe an unreal situation with reference to the present. We imagine a hypothetical situation which contrasts with reality:
Would + infinitive can refer to unreal situations in the present or future. An unreal situation is one which is not true in the present or one which may or may not happen in the future: