could quarterback
Verbo regular: quarterback - quarterbacked- quarterbacked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could quarterback
you could quarterback
she could quarterback
we could quarterback
you could quarterback
they could quarterback 	I could be quarterbacking
you could be quarterbacking
she could be quarterbacking
we could be quarterbacking
you could be quarterbacking
they could be quarterbacking	I could have quarterbacked
you could have quarterbacked
she could have quarterbacked
we could have quarterbacked
you could have quarterbacked
they could have quarterbacked	I could have been quarterbacking
you could have been quarterbacking
she could have been quarterbacking
we could have been quarterbacking
you could have been quarterbacking
they could have been quarterbacking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not quarterback
you could not quarterback
she could not quarterback
we could not quarterback
you could not quarterback
they could not quarterback 	I could not be quarterbacking
you could not be quarterbacking
she could not be quarterbacking
we could not be quarterbacking
you could not be quarterbacking
they could not be quarterbacking	I could not have quarterbacked
you could not have quarterbacked
she could not have quarterbacked
we could not have quarterbacked
you could not have quarterbacked
they could not have quarterbacked	I could not have been quarterbacking
you could not have been quarterbacking
she could not have been quarterbacking
we could not have been quarterbacking
you could not have been quarterbacking
they could not have been quarterbacking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I quarterback?
could you quarterback?
could she quarterback?
could we quarterback?
could you quarterback?
could they quarterback? 	could I be quarterbacking?
could you be quarterbacking?
could she be quarterbacking?
could we be quarterbacking?
could you be quarterbacking?
could they be quarterbacking? 	could I have quarterbacked?
could you have quarterbacked?
could she have quarterbacked?
could we have quarterbacked?
could you have quarterbacked?
could they have quarterbacked? 	could I have been quarterbacking?
could you have been quarterbacking?
could she have been quarterbacking?
could we have been quarterbacking?
could you have been quarterbacking?
could they have been quarterbacking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not quarterback?
could you not quarterback?
could she not quarterback?
could we not quarterback?
could you not quarterback?
could they not quarterback? 	could I not be quarterbacking?
could you not be quarterbacking?
could she not be quarterbacking?
could we not be quarterbacking?
could you not be quarterbacking?
could they not be quarterbacking? 	could I not have quarterbacked?
could you not have quarterbacked?
could she not have quarterbacked?
could we not have quarterbacked?
could you not have quarterbacked?
could they not have quarterbacked? 	could I not have been quarterbacking?
could you not have been quarterbacking?
could she not have been quarterbacking?
could we not have been quarterbacking?
could you not have been quarterbacking?
could they not have been quarterbacking?