Zdania warunkowe (Conditional Sentences)

Conditional Sentences — Complete Guide

Conditional sentences express cause-and-effect relationships. They consist of two clauses: the if-clause (condition) and the main clause (result).

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Zero Conditional — General truths, scientific facts

Structure: If + Present Simple, Present Simple

| Example | Meaning |
|---------|---------|
| If you heat water to 100°C, it boils. | Always true — scientific fact |
| If I eat too much, I feel sick. | Always true — personal experience |
| If it rains, the grass gets wet. | General truth |

Note: You can replace "if" with "when" with no change in meaning: When you press this button, the machine starts.

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First Conditional — Real/possible future situations

Structure: If + Present Simple, will + infinitive

| Example | Meaning |
|---------|---------|
| If she studies hard, she will pass the exam. | Real possibility |
| If it rains tomorrow, we won't go to the beach. | Possible future outcome |
| If you don't hurry, you will miss the bus. | Warning |

Variations in the main clause:

• If you finish early, you can go home. (permission)
• If she calls, tell her I'm busy. (imperative)
• If they arrive late, they might miss the show. (possibility)
• If it snows, we should stay home. (advice)

Signal words: if, unless (= if not), as long as, provided that, on condition that

• I'll go unless it rains. = I'll go if it doesn't rain.

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Second Conditional — Unreal/hypothetical present or future

Structure: If + Past Simple, would + infinitive

| Example | Meaning |
|---------|---------|
| If I had more time, I would travel the world. | But I don't have time (unreal present) |
| If she spoke Polish, she would understand the film. | But she doesn't speak Polish |
| If I were you, I would accept the offer. | Hypothetical advice |
| If I won the lottery, I would buy a house. | Unlikely future |

Important grammar note:

• Use were (not "was") for all persons in formal/standard English: If I were rich..., If she were here...
• In informal speech, "was" is sometimes used: If I was rich... (accepted but less formal)

Variations in the main clause:

• If I knew the answer, I could tell you. (ability)
• If he asked me, I might help. (possibility)

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Third Conditional — Unreal past (impossible to change)

Structure: If + Past Perfect, would have + past participle (V3)

| Example | Meaning |
|---------|---------|
| If I had studied harder, I would have passed. | But I didn't study, so I failed. |
| If they had left earlier, they wouldn't have missed the train. | But they left late. |
| If she had known about the party, she would have come. | But she didn't know. |

Variations:

• If I had known, I could have helped. (past ability)
• If he had asked, I might have said yes. (past possibility)

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Mixed Conditionals

Type 1: Past condition → Present result
Structure: If + Past Perfect, would + infinitive

| Example | Meaning |
|---------|---------|
| If I had studied medicine, I would be a doctor now. | Past decision → present situation |
| If she hadn't moved to Poland, she wouldn't speak Polish. | Past action → present ability |

Type 2: Present condition → Past result
Structure: If + Past Simple, would have + V3

| Example | Meaning |
|---------|---------|
| If I were braver, I would have spoken to her. | Present personality → past action |
| If he weren't so lazy, he would have finished the project. | Present trait → past result |

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Podsumowanie — tabela warunkowych (Summary Table):

| Type | If-clause | Main clause | Time | Reality |
|------|-----------|-------------|------|---------|
| Zero | Present Simple | Present Simple | General | Real/fact |
| First | Present Simple | will + V | Future | Real/possible |
| Second | Past Simple | would + V | Present/Future | Unreal/hypothetical |
| Third | Past Perfect | would have + V3 | Past | Impossible (too late) |
| Mixed 1 | Past Perfect | would + V | Past → Present | Unreal |
| Mixed 2 | Past Simple | would have + V3 | Present → Past | Unreal |

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Najczestsze bledy (Common Mistakes):

• ✗ If I will go there, I will see him. → ✓ If I go there, I will see him.
• ✗ If I would know, I would tell you. → ✓ If I knew, I would tell you.
• ✗ If I would have studied... → ✓ If I had studied...
• ✗ If I was you... → ✓ (formal) If I were you...
• ✗ Unless you won't study... → ✓ Unless you study... (unless = if not, already negative)