could decelerate
Verbo regular: decelerate - decelerated- decelerated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could decelerate
you could decelerate
he could decelerate
we could decelerate
you could decelerate
they could decelerate 	I could be decelerating
you could be decelerating
he could be decelerating
we could be decelerating
you could be decelerating
they could be decelerating	I could have decelerated
you could have decelerated
he could have decelerated
we could have decelerated
you could have decelerated
they could have decelerated	I could have been decelerating
you could have been decelerating
he could have been decelerating
we could have been decelerating
you could have been decelerating
they could have been decelerating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't decelerate
you couldn't decelerate
he couldn't decelerate
we couldn't decelerate
you couldn't decelerate
they couldn't decelerate 	I couldn't be decelerating
you couldn't be decelerating
he couldn't be decelerating
we couldn't be decelerating
you couldn't be decelerating
they couldn't be decelerating	I couldn't have decelerated
you couldn't have decelerated
he couldn't have decelerated
we couldn't have decelerated
you couldn't have decelerated
they couldn't have decelerated	I couldn't have been decelerating
you couldn't have been decelerating
he couldn't have been decelerating
we couldn't have been decelerating
you couldn't have been decelerating
they couldn't have been decelerating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I decelerate?
could you decelerate?
could he decelerate?
could we decelerate?
could you decelerate?
could they decelerate? 	could I be decelerating?
could you be decelerating?
could he be decelerating?
could we be decelerating?
could you be decelerating?
could they be decelerating? 	could I have decelerated?
could you have decelerated?
could he have decelerated?
could we have decelerated?
could you have decelerated?
could they have decelerated? 	could I have been decelerating?
could you have been decelerating?
could he have been decelerating?
could we have been decelerating?
could you have been decelerating?
could they have been decelerating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I decelerate?
couldn't you decelerate?
couldn't he decelerate?
couldn't we decelerate?
couldn't you decelerate?
couldn't they decelerate? 	couldn't I be decelerating?
couldn't you be decelerating?
couldn't he be decelerating?
couldn't we be decelerating?
couldn't you be decelerating?
couldn't they be decelerating? 	couldn't I have decelerated?
couldn't you have decelerated?
couldn't he have decelerated?
couldn't we have decelerated?
couldn't you have decelerated?
couldn't they have decelerated? 	couldn't I have been decelerating?
couldn't you have been decelerating?
couldn't he have been decelerating?
couldn't we have been decelerating?
couldn't you have been decelerating?
couldn't they have been decelerating?