could humidify
Regular verb: humidify - humidified- humidified

Affirmation 	
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I could humidify
you could humidify
he could humidify
we could humidify
you could humidify
they could humidify 	I could be humidifying
you could be humidifying
he could be humidifying
we could be humidifying
you could be humidifying
they could be humidifying	I could have humidified
you could have humidified
he could have humidified
we could have humidified
you could have humidified
they could have humidified	I could have been humidifying
you could have been humidifying
he could have been humidifying
we could have been humidifying
you could have been humidifying
they could have been humidifying	

Negation 	
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I could not humidify
you could not humidify
he could not humidify
we could not humidify
you could not humidify
they could not humidify 	I could not be humidifying
you could not be humidifying
he could not be humidifying
we could not be humidifying
you could not be humidifying
they could not be humidifying	I could not have humidified
you could not have humidified
he could not have humidified
we could not have humidified
you could not have humidified
they could not have humidified	I could not have been humidifying
you could not have been humidifying
he could not have been humidifying
we could not have been humidifying
you could not have been humidifying
they could not have been humidifying	

Interrogative form 	
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could I humidify?
could you humidify?
could he humidify?
could we humidify?
could you humidify?
could they humidify? 	could I be humidifying?
could you be humidifying?
could he be humidifying?
could we be humidifying?
could you be humidifying?
could they be humidifying? 	could I have humidified?
could you have humidified?
could he have humidified?
could we have humidified?
could you have humidified?
could they have humidified? 	could I have been humidifying?
could you have been humidifying?
could he have been humidifying?
could we have been humidifying?
could you have been humidifying?
could they have been humidifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not humidify?
could you not humidify?
could he not humidify?
could we not humidify?
could you not humidify?
could they not humidify? 	could I not be humidifying?
could you not be humidifying?
could he not be humidifying?
could we not be humidifying?
could you not be humidifying?
could they not be humidifying? 	could I not have humidified?
could you not have humidified?
could he not have humidified?
could we not have humidified?
could you not have humidified?
could they not have humidified? 	could I not have been humidifying?
could you not have been humidifying?
could he not have been humidifying?
could we not have been humidifying?
could you not have been humidifying?
could they not have been humidifying?