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If and Unless clauses in zero and 1st conditiona ...
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You’ll need to wear these goggles if you carry out the experiment.
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The film won’t record unless you switch on the DVD player first.
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If you mix red and green, you get yellow.
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If you put a fresh egg in water, it doesn’t float.
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Unless you use an umbrella, you’ll get wet.
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If you freeze water, it turns to ice.
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