could backstop
Verbo regular: backstop - backstoped- backstoped

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could backstop
you could backstop
he could backstop
we could backstop
you could backstop
they could backstop 	I could be backstoping
you could be backstoping
he could be backstoping
we could be backstoping
you could be backstoping
they could be backstoping	I could have backstoped
you could have backstoped
he could have backstoped
we could have backstoped
you could have backstoped
they could have backstoped	I could have been backstoping
you could have been backstoping
he could have been backstoping
we could have been backstoping
you could have been backstoping
they could have been backstoping	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not backstop
you could not backstop
he could not backstop
we could not backstop
you could not backstop
they could not backstop 	I could not be backstoping
you could not be backstoping
he could not be backstoping
we could not be backstoping
you could not be backstoping
they could not be backstoping	I could not have backstoped
you could not have backstoped
he could not have backstoped
we could not have backstoped
you could not have backstoped
they could not have backstoped	I could not have been backstoping
you could not have been backstoping
he could not have been backstoping
we could not have been backstoping
you could not have been backstoping
they could not have been backstoping	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I backstop?
could you backstop?
could he backstop?
could we backstop?
could you backstop?
could they backstop? 	could I be backstoping?
could you be backstoping?
could he be backstoping?
could we be backstoping?
could you be backstoping?
could they be backstoping? 	could I have backstoped?
could you have backstoped?
could he have backstoped?
could we have backstoped?
could you have backstoped?
could they have backstoped? 	could I have been backstoping?
could you have been backstoping?
could he have been backstoping?
could we have been backstoping?
could you have been backstoping?
could they have been backstoping? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not backstop?
could you not backstop?
could he not backstop?
could we not backstop?
could you not backstop?
could they not backstop? 	could I not be backstoping?
could you not be backstoping?
could he not be backstoping?
could we not be backstoping?
could you not be backstoping?
could they not be backstoping? 	could I not have backstoped?
could you not have backstoped?
could he not have backstoped?
could we not have backstoped?
could you not have backstoped?
could they not have backstoped? 	could I not have been backstoping?
could you not have been backstoping?
could he not have been backstoping?
could we not have been backstoping?
could you not have been backstoping?
could they not have been backstoping?