could answer
Verbo regular: answer - answered- answered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could answer
you could answer
she could answer
we could answer
you could answer
they could answer 	I could be answering
you could be answering
she could be answering
we could be answering
you could be answering
they could be answering	I could have answered
you could have answered
she could have answered
we could have answered
you could have answered
they could have answered	I could have been answering
you could have been answering
she could have been answering
we could have been answering
you could have been answering
they could have been answering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't answer
you couldn't answer
she couldn't answer
we couldn't answer
you couldn't answer
they couldn't answer 	I couldn't be answering
you couldn't be answering
she couldn't be answering
we couldn't be answering
you couldn't be answering
they couldn't be answering	I couldn't have answered
you couldn't have answered
she couldn't have answered
we couldn't have answered
you couldn't have answered
they couldn't have answered	I couldn't have been answering
you couldn't have been answering
she couldn't have been answering
we couldn't have been answering
you couldn't have been answering
they couldn't have been answering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I answer?
could you answer?
could she answer?
could we answer?
could you answer?
could they answer? 	could I be answering?
could you be answering?
could she be answering?
could we be answering?
could you be answering?
could they be answering? 	could I have answered?
could you have answered?
could she have answered?
could we have answered?
could you have answered?
could they have answered? 	could I have been answering?
could you have been answering?
could she have been answering?
could we have been answering?
could you have been answering?
could they have been answering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I answer?
couldn't you answer?
couldn't she answer?
couldn't we answer?
couldn't you answer?
couldn't they answer? 	couldn't I be answering?
couldn't you be answering?
couldn't she be answering?
couldn't we be answering?
couldn't you be answering?
couldn't they be answering? 	couldn't I have answered?
couldn't you have answered?
couldn't she have answered?
couldn't we have answered?
couldn't you have answered?
couldn't they have answered? 	couldn't I have been answering?
couldn't you have been answering?
couldn't she have been answering?
couldn't we have been answering?
couldn't you have been answering?
couldn't they have been answering?