Conditional Sentences Rule

Conditional sentences are used to express a condition and its possible result. Example types:

• Zero: If + present, present
• First: If + present, will + base verb
• Second: If + past, would + base verb
• Third: If + had + past participle, would have + past participle

If you heat water to 100°C, it boils. (Zero Conditional)

If he studies hard, he will pass. (First Conditional)

If I were you, I would take the job. (Second Conditional)

If she had seen him, she would have told you. (Third Conditional)