could purify
Verbo regular: purify - purified- purified

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could purify
you could purify
he could purify
we could purify
you could purify
they could purify 	I could be purifying
you could be purifying
he could be purifying
we could be purifying
you could be purifying
they could be purifying	I could have purified
you could have purified
he could have purified
we could have purified
you could have purified
they could have purified	I could have been purifying
you could have been purifying
he could have been purifying
we could have been purifying
you could have been purifying
they could have been purifying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't purify
you couldn't purify
he couldn't purify
we couldn't purify
you couldn't purify
they couldn't purify 	I couldn't be purifying
you couldn't be purifying
he couldn't be purifying
we couldn't be purifying
you couldn't be purifying
they couldn't be purifying	I couldn't have purified
you couldn't have purified
he couldn't have purified
we couldn't have purified
you couldn't have purified
they couldn't have purified	I couldn't have been purifying
you couldn't have been purifying
he couldn't have been purifying
we couldn't have been purifying
you couldn't have been purifying
they couldn't have been purifying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I purify?
could you purify?
could he purify?
could we purify?
could you purify?
could they purify? 	could I be purifying?
could you be purifying?
could he be purifying?
could we be purifying?
could you be purifying?
could they be purifying? 	could I have purified?
could you have purified?
could he have purified?
could we have purified?
could you have purified?
could they have purified? 	could I have been purifying?
could you have been purifying?
could he have been purifying?
could we have been purifying?
could you have been purifying?
could they have been purifying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I purify?
couldn't you purify?
couldn't he purify?
couldn't we purify?
couldn't you purify?
couldn't they purify? 	couldn't I be purifying?
couldn't you be purifying?
couldn't he be purifying?
couldn't we be purifying?
couldn't you be purifying?
couldn't they be purifying? 	couldn't I have purified?
couldn't you have purified?
couldn't he have purified?
couldn't we have purified?
couldn't you have purified?
couldn't they have purified? 	couldn't I have been purifying?
couldn't you have been purifying?
couldn't he have been purifying?
couldn't we have been purifying?
couldn't you have been purifying?
couldn't they have been purifying?