could calk
Verbo regular: calk - calked- calked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could calk
you could calk
he could calk
we could calk
you could calk
they could calk 	I could be calking
you could be calking
he could be calking
we could be calking
you could be calking
they could be calking	I could have calked
you could have calked
he could have calked
we could have calked
you could have calked
they could have calked	I could have been calking
you could have been calking
he could have been calking
we could have been calking
you could have been calking
they could have been calking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't calk
you couldn't calk
he couldn't calk
we couldn't calk
you couldn't calk
they couldn't calk 	I couldn't be calking
you couldn't be calking
he couldn't be calking
we couldn't be calking
you couldn't be calking
they couldn't be calking	I couldn't have calked
you couldn't have calked
he couldn't have calked
we couldn't have calked
you couldn't have calked
they couldn't have calked	I couldn't have been calking
you couldn't have been calking
he couldn't have been calking
we couldn't have been calking
you couldn't have been calking
they couldn't have been calking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I calk?
could you calk?
could he calk?
could we calk?
could you calk?
could they calk? 	could I be calking?
could you be calking?
could he be calking?
could we be calking?
could you be calking?
could they be calking? 	could I have calked?
could you have calked?
could he have calked?
could we have calked?
could you have calked?
could they have calked? 	could I have been calking?
could you have been calking?
could he have been calking?
could we have been calking?
could you have been calking?
could they have been calking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I calk?
couldn't you calk?
couldn't he calk?
couldn't we calk?
couldn't you calk?
couldn't they calk? 	couldn't I be calking?
couldn't you be calking?
couldn't he be calking?
couldn't we be calking?
couldn't you be calking?
couldn't they be calking? 	couldn't I have calked?
couldn't you have calked?
couldn't he have calked?
couldn't we have calked?
couldn't you have calked?
couldn't they have calked? 	couldn't I have been calking?
couldn't you have been calking?
couldn't he have been calking?
couldn't we have been calking?
couldn't you have been calking?
couldn't they have been calking?