First Conditional

In this lesson, you will learn how to use the first conditional to talk about a possible future situation and its result.

1. What Is the First Conditional?

The first conditional is used for real or possible future situations and their results.

2. Structure of the First Conditional

Structure: If + present simple, ... will + base verb; or will + base verb + if + present simple.

Use a comma when the if-clause comes first.

Example:

• “If it rains tomorrow, we will stay at home.”
• “If I finish my homework, I will watch TV.”
• “If she studies hard, she will pass the test.”

You can also change the order:

• “We will stay at home if it rains tomorrow.”

3. Common Uses of the First Conditional

We use the first conditional for real future possibilities in specific situations.

A. Real Future Possibilities

• “If I have time, I will visit my friend.”
• “If the bus is late, I will be late for school.”

B. Warnings and likely results

• “If you touch that, you will hurt yourself.”
• “If you don’t study, you will fail.”

4. Zero vs First Conditional

Zero conditional

• Time: Always true / facts
• Use: Facts, habits, general truths
• Structure: If clause (present simple) + main clause (present simple)

(If this happens, that happens)

• Example:

  “If you press the button, the light turns on.”

Why we use zero conditional: This is a fact, always true whenever you press the button.
Cause and effect: pressing the button → light turns on.
General truth, not a specific situation.

First conditional

• Time: Specific situation in the future
• Use: Realistic future events
• Structure: If clause (present simple) + main clause (will + main verb)

(If this happens, that will happen)

• Example:

  “If you press the button tomorrow, the light will turn on.”

Why we use first conditional: This talks about a specific situation in the future (tomorrow).
Real possibility: the light will turn on if someone presses the button tomorrow.
We use will + base verb for the main clause because it refers to a future action.

6. Easy Way to Remember

• Zero Conditional: If this happens → that always happens
• First Conditional: If this happens, that will probably happen in this future situation.