What's the conditional?
When do we use first conditional?
Possible situations for the future; cause and effect
When do we use type 2 conditionals?
Imaginary/hypothetical situations, untrue to present
Compare 0, 1, and 2 conditionals
type 0: general truth, if-clause (present), main clause (present) type 1: possible situations, if-clause (present), main clause (future) type 2: imaginary situation, untrue to present, if-clause (past), main clause (would + bare infinitive)