The first conditional is used to talk about things that are likely to happen in the future, based on a specific condition being met.

Positive: If + subject + present simple, subject + will + infinitive
Negative: If + subject + present simple, subject + will not + infinitive
Question: If + subject + present simple, will + subject + infinitive?

Common uses:

1. To talk about future possibilities

• If I have time, I will go to the shop.
• If it snows, I will not be able to drive to work.
• If she gets the job, will she move?

2. To give warnings or make predictions

• If you eat too much junk food, you will get sick.
• If we ignore science, we won’t stop climate change.
• If we don’t leave soon, will we miss the movie?

3. To make suggestions or recommendations

• If you study hard, you will pass the test.
• If you sleep, you won’t understand the lesson.
• If you need help, will he assist you?