could list
Verbo regular: list - listed- listed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could list
you could list
he could list
we could list
you could list
they could list 	I could be listing
you could be listing
he could be listing
we could be listing
you could be listing
they could be listing	I could have listed
you could have listed
he could have listed
we could have listed
you could have listed
they could have listed	I could have been listing
you could have been listing
he could have been listing
we could have been listing
you could have been listing
they could have been listing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't list
you couldn't list
he couldn't list
we couldn't list
you couldn't list
they couldn't list 	I couldn't be listing
you couldn't be listing
he couldn't be listing
we couldn't be listing
you couldn't be listing
they couldn't be listing	I couldn't have listed
you couldn't have listed
he couldn't have listed
we couldn't have listed
you couldn't have listed
they couldn't have listed	I couldn't have been listing
you couldn't have been listing
he couldn't have been listing
we couldn't have been listing
you couldn't have been listing
they couldn't have been listing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I list?
could you list?
could he list?
could we list?
could you list?
could they list? 	could I be listing?
could you be listing?
could he be listing?
could we be listing?
could you be listing?
could they be listing? 	could I have listed?
could you have listed?
could he have listed?
could we have listed?
could you have listed?
could they have listed? 	could I have been listing?
could you have been listing?
could he have been listing?
could we have been listing?
could you have been listing?
could they have been listing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I list?
couldn't you list?
couldn't he list?
couldn't we list?
couldn't you list?
couldn't they list? 	couldn't I be listing?
couldn't you be listing?
couldn't he be listing?
couldn't we be listing?
couldn't you be listing?
couldn't they be listing? 	couldn't I have listed?
couldn't you have listed?
couldn't he have listed?
couldn't we have listed?
couldn't you have listed?
couldn't they have listed? 	couldn't I have been listing?
couldn't you have been listing?
couldn't he have been listing?
couldn't we have been listing?
couldn't you have been listing?
couldn't they have been listing?