ought to thunder
Regular verb: thunder - thundered- thundered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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it ought to thunder
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it ought to be thundering
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it ought to have thundered
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it ought to have been thundering
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Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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it ought not to thunder
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it ought not to thundering
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it ought not to have thundered
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it ought not to have been thundering
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Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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ought to it thunder?
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ought to it be thundering?
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ought to it have thundered?
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ought to it have been thundering?
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Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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ought it not to thunder?
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ought it not to be thundering?
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ought it not to have thundered?
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ought it not to have been thundering?
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