could retighten
Verbo regular: retighten - retightened- retightened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could retighten
you could retighten
he could retighten
we could retighten
you could retighten
they could retighten 	I could be retightening
you could be retightening
he could be retightening
we could be retightening
you could be retightening
they could be retightening	I could have retightened
you could have retightened
he could have retightened
we could have retightened
you could have retightened
they could have retightened	I could have been retightening
you could have been retightening
he could have been retightening
we could have been retightening
you could have been retightening
they could have been retightening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't retighten
you couldn't retighten
he couldn't retighten
we couldn't retighten
you couldn't retighten
they couldn't retighten 	I couldn't be retightening
you couldn't be retightening
he couldn't be retightening
we couldn't be retightening
you couldn't be retightening
they couldn't be retightening	I couldn't have retightened
you couldn't have retightened
he couldn't have retightened
we couldn't have retightened
you couldn't have retightened
they couldn't have retightened	I couldn't have been retightening
you couldn't have been retightening
he couldn't have been retightening
we couldn't have been retightening
you couldn't have been retightening
they couldn't have been retightening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I retighten?
could you retighten?
could he retighten?
could we retighten?
could you retighten?
could they retighten? 	could I be retightening?
could you be retightening?
could he be retightening?
could we be retightening?
could you be retightening?
could they be retightening? 	could I have retightened?
could you have retightened?
could he have retightened?
could we have retightened?
could you have retightened?
could they have retightened? 	could I have been retightening?
could you have been retightening?
could he have been retightening?
could we have been retightening?
could you have been retightening?
could they have been retightening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I retighten?
couldn't you retighten?
couldn't he retighten?
couldn't we retighten?
couldn't you retighten?
couldn't they retighten? 	couldn't I be retightening?
couldn't you be retightening?
couldn't he be retightening?
couldn't we be retightening?
couldn't you be retightening?
couldn't they be retightening? 	couldn't I have retightened?
couldn't you have retightened?
couldn't he have retightened?
couldn't we have retightened?
couldn't you have retightened?
couldn't they have retightened? 	couldn't I have been retightening?
couldn't you have been retightening?
couldn't he have been retightening?
couldn't we have been retightening?
couldn't you have been retightening?
couldn't they have been retightening?