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If I had known you were coming, I would have cooked.
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If I had known about the rain, I would have taken an umbrella.
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If I had known the time, I would have been early.
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If I had known you were sick, I would have visited you.
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If I had known it was free, I would have gone.
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If I had known the project was so urgent, I would have worked late.
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If I had known about the traffic, I would have taken the subway.
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If I had known his real intention, I would have refused the offer.
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If I had known the software was buggy, I would have waited to buy it.
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If I had known about the meeting, I would have prepared the report.
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If I had known about the fiscal discrepancies, I would have requested an audit.
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If I had known the geopolitical risks, I would have advised against the merger.
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If I had known the long-term implications, I would have chosen differently.
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If I had known the research was flawed, I would have questioned the results.
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If I had known the extent of the crisis, I would have acted more decisively.