could atone
Regular verb: atone - atoned- atoned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could atone
you could atone
he could atone
we could atone
you could atone
they could atone 	I could be atoning
you could be atoning
he could be atoning
we could be atoning
you could be atoning
they could be atoning	I could have atoned
you could have atoned
he could have atoned
we could have atoned
you could have atoned
they could have atoned	I could have been atoning
you could have been atoning
he could have been atoning
we could have been atoning
you could have been atoning
they could have been atoning	

Negation 	
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I couldn't atone
you couldn't atone
he couldn't atone
we couldn't atone
you couldn't atone
they couldn't atone 	I couldn't be atoning
you couldn't be atoning
he couldn't be atoning
we couldn't be atoning
you couldn't be atoning
they couldn't be atoning	I couldn't have atoned
you couldn't have atoned
he couldn't have atoned
we couldn't have atoned
you couldn't have atoned
they couldn't have atoned	I couldn't have been atoning
you couldn't have been atoning
he couldn't have been atoning
we couldn't have been atoning
you couldn't have been atoning
they couldn't have been atoning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I atone?
could you atone?
could he atone?
could we atone?
could you atone?
could they atone? 	could I be atoning?
could you be atoning?
could he be atoning?
could we be atoning?
could you be atoning?
could they be atoning? 	could I have atoned?
could you have atoned?
could he have atoned?
could we have atoned?
could you have atoned?
could they have atoned? 	could I have been atoning?
could you have been atoning?
could he have been atoning?
could we have been atoning?
could you have been atoning?
could they have been atoning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I atone?
couldn't you atone?
couldn't he atone?
couldn't we atone?
couldn't you atone?
couldn't they atone? 	couldn't I be atoning?
couldn't you be atoning?
couldn't he be atoning?
couldn't we be atoning?
couldn't you be atoning?
couldn't they be atoning? 	couldn't I have atoned?
couldn't you have atoned?
couldn't he have atoned?
couldn't we have atoned?
couldn't you have atoned?
couldn't they have atoned? 	couldn't I have been atoning?
couldn't you have been atoning?
couldn't he have been atoning?
couldn't we have been atoning?
couldn't you have been atoning?
couldn't they have been atoning?