could talk
Verbo regular: talk - talked- talked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could talk
you could talk
he could talk
we could talk
you could talk
they could talk 	I could be talking
you could be talking
he could be talking
we could be talking
you could be talking
they could be talking	I could have talked
you could have talked
he could have talked
we could have talked
you could have talked
they could have talked	I could have been talking
you could have been talking
he could have been talking
we could have been talking
you could have been talking
they could have been talking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't talk
you couldn't talk
he couldn't talk
we couldn't talk
you couldn't talk
they couldn't talk 	I couldn't be talking
you couldn't be talking
he couldn't be talking
we couldn't be talking
you couldn't be talking
they couldn't be talking	I couldn't have talked
you couldn't have talked
he couldn't have talked
we couldn't have talked
you couldn't have talked
they couldn't have talked	I couldn't have been talking
you couldn't have been talking
he couldn't have been talking
we couldn't have been talking
you couldn't have been talking
they couldn't have been talking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I talk?
could you talk?
could he talk?
could we talk?
could you talk?
could they talk? 	could I be talking?
could you be talking?
could he be talking?
could we be talking?
could you be talking?
could they be talking? 	could I have talked?
could you have talked?
could he have talked?
could we have talked?
could you have talked?
could they have talked? 	could I have been talking?
could you have been talking?
could he have been talking?
could we have been talking?
could you have been talking?
could they have been talking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I talk?
couldn't you talk?
couldn't he talk?
couldn't we talk?
couldn't you talk?
couldn't they talk? 	couldn't I be talking?
couldn't you be talking?
couldn't he be talking?
couldn't we be talking?
couldn't you be talking?
couldn't they be talking? 	couldn't I have talked?
couldn't you have talked?
couldn't he have talked?
couldn't we have talked?
couldn't you have talked?
couldn't they have talked? 	couldn't I have been talking?
couldn't you have been talking?
couldn't he have been talking?
couldn't we have been talking?
couldn't you have been talking?
couldn't they have been talking?