could background
Regular verb: background - backgrounded- backgrounded

Affirmation 	
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I could background
you could background
he could background
we could background
you could background
they could background 	I could be backgrounding
you could be backgrounding
he could be backgrounding
we could be backgrounding
you could be backgrounding
they could be backgrounding	I could have backgrounded
you could have backgrounded
he 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
he could have been backgrounding
we could have been backgrounding
you could have been backgrounding
they could have been backgrounding	

Negation 	
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I couldn't background
you couldn't background
he couldn't background
we couldn't background
you couldn't background
they couldn't background 	I couldn't be backgrounding
you couldn't be backgrounding
he couldn't be backgrounding
we couldn't be backgrounding
you couldn't be backgrounding
they couldn't be backgrounding	I couldn't have backgrounded
you couldn't have backgrounded
he couldn't have backgrounded
we couldn't have backgrounded
you couldn't have backgrounded
they couldn't have backgrounded	I couldn't have been backgrounding
you couldn't have been backgrounding
he couldn't have been backgrounding
we couldn't have been backgrounding
you couldn't have been backgrounding
they couldn't have been backgrounding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I background?
could you background?
could he background?
could we background?
could you background?
could they background? 	could I be backgrounding?
could you be backgrounding?
could he be backgrounding?
could we be backgrounding?
could you be backgrounding?
could they be backgrounding? 	could I have backgrounded?
could you have backgrounded?
could he 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 he have been backgrounding?
could we have been backgrounding?
could you have been backgrounding?
could they have been backgrounding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I background?
couldn't you background?
couldn't he background?
couldn't we background?
couldn't you background?
couldn't they background? 	couldn't I be backgrounding?
couldn't you be backgrounding?
couldn't he be backgrounding?
couldn't we be backgrounding?
couldn't you be backgrounding?
couldn't they be backgrounding? 	couldn't I have backgrounded?
couldn't you have backgrounded?
couldn't he have backgrounded?
couldn't we have backgrounded?
couldn't you have backgrounded?
couldn't they have backgrounded? 	couldn't I have been backgrounding?
couldn't you have been backgrounding?
couldn't he have been backgrounding?
couldn't we have been backgrounding?
couldn't you have been backgrounding?
couldn't they have been backgrounding?