could background
Verbo regular: background - backgrounded- backgrounded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could background
you could background
she could background
we could background
you could background
they could background 	I could be backgrounding
you could be backgrounding
she could be backgrounding
we could be backgrounding
you could be backgrounding
they could be backgrounding	I could have backgrounded
you could have backgrounded
she could have backgrounded
we could have backgrounded
you could have backgrounded
they could have backgrounded	I could have been backgrounding
you could have been backgrounding
she could have been backgrounding
we could have been backgrounding
you could have been backgrounding
they could have been backgrounding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not background
you could not background
she could not background
we could not background
you could not background
they could not background 	I could not be backgrounding
you could not be backgrounding
she could not be backgrounding
we could not be backgrounding
you could not be backgrounding
they could not be backgrounding	I could not have backgrounded
you could not have backgrounded
she could not have backgrounded
we could not have backgrounded
you could not have backgrounded
they could not have backgrounded	I could not have been backgrounding
you could not have been backgrounding
she could not have been backgrounding
we could not have been backgrounding
you could not have been backgrounding
they could not have been backgrounding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I background?
could you background?
could she background?
could we background?
could you background?
could they background? 	could I be backgrounding?
could you be backgrounding?
could she be backgrounding?
could we be backgrounding?
could you be backgrounding?
could they be backgrounding? 	could I have backgrounded?
could you have backgrounded?
could she have backgrounded?
could we have backgrounded?
could you have backgrounded?
could they have backgrounded? 	could I have been backgrounding?
could you have been backgrounding?
could she have been backgrounding?
could we have been backgrounding?
could you have been backgrounding?
could they have been backgrounding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not background?
could you not background?
could she not background?
could we not background?
could you not background?
could they not background? 	could I not be backgrounding?
could you not be backgrounding?
could she not be backgrounding?
could we not be backgrounding?
could you not be backgrounding?
could they not be backgrounding? 	could I not have backgrounded?
could you not have backgrounded?
could she not have backgrounded?
could we not have backgrounded?
could you not have backgrounded?
could they not have backgrounded? 	could I not have been backgrounding?
could you not have been backgrounding?
could she not have been backgrounding?
could we not have been backgrounding?
could you not have been backgrounding?
could they not have been backgrounding?