could snow
Verbo regular: snow - snowed- snowed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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it could snow
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it could be snowing
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it could have snowed
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it could have been snowing
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Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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it could not snow
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it could not be snowing
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it could not have snowed
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it could not have been snowing
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Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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could it snow?
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could it be snowing?
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could it have snowed?
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could it have been snowing?
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Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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could it not snow?
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could it not be snowing?
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could it not have snowed?
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could it not have been snowing?
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