Overview
The first conditional expresses real and possible situations in the future. It uses if + present simple in the condition clause and will + infinitive in the result clause. Example: If it rains, I will stay home. The situation is genuinely possible.
Structure
- If-clauseIf + present simple …
- Main clause… will + base verb
- ReversedWill clause can come first: I'll stay if it rains.
Key Rules
- Expresses real, possible future outcomes
- If-clause uses present simple, never will
- Comma after if-clause when it comes first
- Can/may/might/should can replace will in the result
Common Mistakes
- ❌ If it will rain → ✅ If it rains
- ❌ If she will come → ✅ If she comes
- ❌ I'll call if I'll have time → ✅ if I have time
When to use
Possible Conditions
If it rains, we will cancel the trip.
Cause and Effect
If you study, you will pass the exam.
Warnings
If you touch that, it will break.
Offers & Promises
If you help me, I'll help you.