If I send it today, it will arrive in time.
If I send this letter, it will arrive in time in Chicago in two days.
If the government had responded more quickly, fewer people would have suffered from food poisoning.
People would be able to fly if they had wings.
What would we use to look at ourselves if we had feathers instead of hair?
If I feel the way you do, I'll drop the class.
If it doesn't rain soon, a lot of crops will die. If the crops die, many people will starve this coming winter.
If anyone else brought extra guests, we wouldn't have enough seats at the table.
The sentences are in the form of "If clause" statements, also known as "conditional sentences." These are statements that describe the relationship between a possible situation and its expected outcome. In each sentence, the first part (after "If") describes the condition or situation, and the second part describes what would happen as a result.