Conditionals are sentences with a condition and a result.
Structure:
If + condition, result
or
Result + if + condition
Main Types:
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Zero Conditional
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If + present simple, present simple
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Example:
If you heat water, it boils.
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First Conditional
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If + present simple, will + base verb
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Example:
If it rains, we will stay at home.
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Second Conditional
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If + past simple, would + base verb
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Example:
If I had a car, I would drive to work.
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Third Conditional
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If + past perfect, would have + past participle
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Example:
If I had studied, I would have passed the exam.