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