should snow
Regular verb: snow - snowed- snowed

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