Afirmación
Forma simple
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it should freeze
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Forma con V-ing
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it should be freezing
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Perfecto
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it should have frozen
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Perfecto con V-ing
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it should have been freezing
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Negación
Forma simple
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it should not freeze
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Forma con V-ing
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it should not be freezing
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Perfecto
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it should not have frozen
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Perfecto con V-ing
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it should not have been freezing
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Forma interrogativa
Forma simple
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should it freeze?
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Forma con V-ing
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should it be freezing?
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Perfecto
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should it have frozen?
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Perfecto con V-ing
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should it have been freezing?
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Forma interro-negativa
Forma simple
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should it not freeze?
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Forma con V-ing
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should it not be freezing?
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Perfecto
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should it not have frozen?
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Perfecto con V-ing
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should it not have been freezing?
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