ought to snow
Regular verb: snow - snowed- snowed

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