may snow
Regular verb: snow - snowed- snowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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it may snow
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it may be snowing
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it may have snowed
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it may have been snowing
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Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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it may not snow
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it may not be snowing
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it may not have snowed
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it may not have been snowing
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Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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may it snow?
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may it be snowing?
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may it have snowed?
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may it have been snowing?
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Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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may it not snow?
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may it not be snowing?
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may it not have snowed?
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may it not have been snowing?
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