🔀 Conditional Sentences: Zero to Third
If this, then that — four patterns for different levels of reality
Zero Conditional — General Truths
The Zero Conditional describes things that are always true — scientific facts, general rules, and automatic results. Both clauses use the Present Simple.
| If-clause | Result clause | Full sentence |
|---|---|---|
| If you heat water to 100°C, | it boils. | If you heat water to 100°C, it boils. |
| If you mix red and blue, | you get purple. | If you mix red and blue, you get purple. |
| If I eat too much, | I feel sick. | If I eat too much, I feel sick. |
| If it rains, | the ground gets wet. | If it rains, the ground gets wet. |
First Conditional — Real / Likely Future
The First Conditional describes realistic, possible future situations. The if-clause uses Present Simple, and the result clause uses "will + base verb."
| If-clause (Present Simple) | Result (will + verb) | Situation |
|---|---|---|
| If it rains tomorrow, | I will stay home. | Real possibility |
| If you study hard, | you will pass the exam. | Likely outcome |
| If she calls, | I will tell her. | Possible event |
| If we don't hurry, | we will miss the train. | Warning |
Second Conditional — Unreal / Hypothetical Present
The Second Conditional describes imaginary or unlikely situations in the present or future. The if-clause uses Past Simple, and the result uses "would + base verb." The past tense here does NOT refer to the past — it signals unreality.
| If-clause (Past Simple) | Result (would + verb) | Situation |
|---|---|---|
| If I had a million dollars, | I would travel the world. | Imaginary (I don't have it) |
| If I spoke perfect English, | I would work in London. | Hypothetical (I don't yet) |
| If she were here, | she would know what to do. | Unreal (she's not here) |
| If I were you, | I would accept the offer. | Advice (I'm not you) |
Third Conditional — Unreal Past / Regrets
The Third Conditional describes imaginary situations in the past — things that didn't happen. It's used for regrets, missed opportunities, and alternative histories. The if-clause uses Past Perfect, and the result uses "would have + past participle."
| If-clause (Past Perfect) | Result (would have + past part.) | Reality |
|---|---|---|
| If I had studied harder, | I would have passed the exam. | I didn't study → I failed. |
| If she had left earlier, | she would have caught the train. | She left late → she missed it. |
| If they had known, | they would have helped. | They didn't know → they didn't help. |
| If it hadn't rained, | we would have gone to the beach. | It rained → we didn't go. |
Mixed Conditionals & Common Errors
Mixed conditionals combine elements from different types — typically a third conditional if-clause with a second conditional result, or vice versa:
| Pattern | Example | Meaning |
|---|---|---|
| 3rd if + 2nd result | If I had studied medicine, I would be a doctor now. | Past cause → present result |
| 2nd if + 3rd result | If I were braver, I would have asked her out. | Permanent trait → past consequence |
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