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