could coarsen
Verbo regular: coarsen - coarsened- coarsened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could coarsen
you could coarsen
he could coarsen
we could coarsen
you could coarsen
they could coarsen 	I could be coarsening
you could be coarsening
he could be coarsening
we could be coarsening
you could be coarsening
they could be coarsening	I could have coarsened
you could have coarsened
he could have coarsened
we could have coarsened
you could have coarsened
they could have coarsened	I could have been coarsening
you could have been coarsening
he could have been coarsening
we could have been coarsening
you could have been coarsening
they could have been coarsening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not coarsen
you could not coarsen
he could not coarsen
we could not coarsen
you could not coarsen
they could not coarsen 	I could not be coarsening
you could not be coarsening
he could not be coarsening
we could not be coarsening
you could not be coarsening
they could not be coarsening	I could not have coarsened
you could not have coarsened
he could not have coarsened
we could not have coarsened
you could not have coarsened
they could not have coarsened	I could not have been coarsening
you could not have been coarsening
he could not have been coarsening
we could not have been coarsening
you could not have been coarsening
they could not have been coarsening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I coarsen?
could you coarsen?
could he coarsen?
could we coarsen?
could you coarsen?
could they coarsen? 	could I be coarsening?
could you be coarsening?
could he be coarsening?
could we be coarsening?
could you be coarsening?
could they be coarsening? 	could I have coarsened?
could you have coarsened?
could he have coarsened?
could we have coarsened?
could you have coarsened?
could they have coarsened? 	could I have been coarsening?
could you have been coarsening?
could he have been coarsening?
could we have been coarsening?
could you have been coarsening?
could they have been coarsening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not coarsen?
could you not coarsen?
could he not coarsen?
could we not coarsen?
could you not coarsen?
could they not coarsen? 	could I not be coarsening?
could you not be coarsening?
could he not be coarsening?
could we not be coarsening?
could you not be coarsening?
could they not be coarsening? 	could I not have coarsened?
could you not have coarsened?
could he not have coarsened?
could we not have coarsened?
could you not have coarsened?
could they not have coarsened? 	could I not have been coarsening?
could you not have been coarsening?
could he not have been coarsening?
could we not have been coarsening?
could you not have been coarsening?
could they not have been coarsening?