If I don’t find Jack at home, I (leave) him a message.
If I had known it, I (come) earlier.
If he had not been so frustrated, he (not miss) the bus.
Had I time, I (study) Spanish.
If I were you, I (go) there myself.
If you heat water, it (boil).
If you had gone to the party, you (see) Alan.
If I were you, I (call) your mom.
If I could, I (cycle) a lot.