Afirmação
Forma simple
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it must snow
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Forma com V-ing
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it must be snowing
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Perfeito
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it must have snowed
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Perfeito com V-ing
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it must have been snowing
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Negação
Forma simple
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it must not snow
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Forma com V-ing
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it must not be snowing
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Perfeito
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it must not have snowed
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Perfeito com V-ing
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it must not have been snowing
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Forma interrogativa
Forma simple
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must it snow?
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Forma com V-ing
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must it be snowing?
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Perfeito
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must it have snowed?
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Perfeito com V-ing
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must it have been snowing?
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Forma interro-Negação
Forma simple
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must it not snow?
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Forma com V-ing
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must it not be snowing?
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Perfeito
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must it not have snowed?
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Perfeito com V-ing
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must it not have been snowing?
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