First you are "confused by" not "confusing by".Originally Posted by bettysuy
Zero Conditional: used for habitual actions or accepted facts
It is created by if/when + two clauses with the same tense in each clause.
When I ate at Joe's, I had the ravioli. (past-past)
If I work late on a Tuesday, I take a taxi home. (present -present)
First Conditional: if + present tense, then future tense
If I pass this exam, (then) I will be promoted.
Second conditional: if + past tense, then present conditional
If I passed this exam, (then) I would be promoted.
If I were king (subjunctive), (then) I would eliminate all taxes.
Third conditional: if + past perfect, then past conditional
If I had passed this exam, I would have been promoted.