could rain
Verbo regular: rain - rained- rained

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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it could rain
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it could be raining
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-
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it could have rained
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-
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it could have been raining
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Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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it could not rain
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it could not be raining
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-
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it could not have rained
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-
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it could not have been raining
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Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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could it rain?
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could it be raining?
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-
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could it have rained?
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-
- 	-
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could it have been raining?
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Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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could it not rain?
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-
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could it not be raining?
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-
- 	-
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could it not have rained?
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-
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could it not have been raining?
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