can snow
Regular verb: snow - snowed- snowed

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