What's the conditional?
I would have helped you if you had asked. Now it's too late.
Third conditional
Would you be surprised if it snowed in Brazil?
Second conditional
Make a third conditional sentence. ( You / to forget my birthday / I / to speak to you again)
"If you had forgotten my birthday, I would have never spoken to you again".
Compare 2 and 3 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)