could sleet
Regular verb: sleet - sleeted- sleeted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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it could sleet
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it could be sleeting
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it could have sleeted
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it could have been sleeting
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Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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it couldn't sleet
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it couldn't be sleeting
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it couldn't have sleeted
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it couldn't have been sleeting
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Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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could it sleet?
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could it be sleeting?
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could it have sleeted?
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could it have been sleeting?
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Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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couldn't it sleet?
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couldn't it be sleeting?
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couldn't it have sleeted?
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couldn't it have been sleeting?
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