could purchase
Verbo regular: purchase - purchased- purchased

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could purchase
you could purchase
he could purchase
we could purchase
you could purchase
they could purchase 	I could be purchasing
you could be purchasing
he could be purchasing
we could be purchasing
you could be purchasing
they could be purchasing	I could have purchased
you could have purchased
he could have purchased
we could have purchased
you could have purchased
they could have purchased	I could have been purchasing
you could have been purchasing
he could have been purchasing
we could have been purchasing
you could have been purchasing
they could have been purchasing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't purchase
you couldn't purchase
he couldn't purchase
we couldn't purchase
you couldn't purchase
they couldn't purchase 	I couldn't be purchasing
you couldn't be purchasing
he couldn't be purchasing
we couldn't be purchasing
you couldn't be purchasing
they couldn't be purchasing	I couldn't have purchased
you couldn't have purchased
he couldn't have purchased
we couldn't have purchased
you couldn't have purchased
they couldn't have purchased	I couldn't have been purchasing
you couldn't have been purchasing
he couldn't have been purchasing
we couldn't have been purchasing
you couldn't have been purchasing
they couldn't have been purchasing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I purchase?
could you purchase?
could he purchase?
could we purchase?
could you purchase?
could they purchase? 	could I be purchasing?
could you be purchasing?
could he be purchasing?
could we be purchasing?
could you be purchasing?
could they be purchasing? 	could I have purchased?
could you have purchased?
could he have purchased?
could we have purchased?
could you have purchased?
could they have purchased? 	could I have been purchasing?
could you have been purchasing?
could he have been purchasing?
could we have been purchasing?
could you have been purchasing?
could they have been purchasing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I purchase?
couldn't you purchase?
couldn't he purchase?
couldn't we purchase?
couldn't you purchase?
couldn't they purchase? 	couldn't I be purchasing?
couldn't you be purchasing?
couldn't he be purchasing?
couldn't we be purchasing?
couldn't you be purchasing?
couldn't they be purchasing? 	couldn't I have purchased?
couldn't you have purchased?
couldn't he have purchased?
couldn't we have purchased?
couldn't you have purchased?
couldn't they have purchased? 	couldn't I have been purchasing?
couldn't you have been purchasing?
couldn't he have been purchasing?
couldn't we have been purchasing?
couldn't you have been purchasing?
couldn't they have been purchasing?