could purchase
Verbo regular: purchase - purchased- purchased

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not purchase
you could not purchase
he could not purchase
we could not purchase
you could not purchase
they could not purchase 	I could not be purchasing
you could not be purchasing
he could not be purchasing
we could not be purchasing
you could not be purchasing
they could not be purchasing	I could not have purchased
you could not have purchased
he could not have purchased
we could not have purchased
you could not have purchased
they could not have purchased	I could not have been purchasing
you could not have been purchasing
he could not have been purchasing
we could not have been purchasing
you could not have been purchasing
they could not have been purchasing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not purchase?
could you not purchase?
could he not purchase?
could we not purchase?
could you not purchase?
could they not purchase? 	could I not be purchasing?
could you not be purchasing?
could he not be purchasing?
could we not be purchasing?
could you not be purchasing?
could they not be purchasing? 	could I not have purchased?
could you not have purchased?
could he not have purchased?
could we not have purchased?
could you not have purchased?
could they not have purchased? 	could I not have been purchasing?
could you not have been purchasing?
could he not have been purchasing?
could we not have been purchasing?
could you not have been purchasing?
could they not have been purchasing?