could overbalance
Regular verb: overbalance - overbalanced- overbalanced

Affirmation 	
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I could overbalance
you could overbalance
he could overbalance
we could overbalance
you could overbalance
they could overbalance 	I could be overbalancing
you could be overbalancing
he could be overbalancing
we could be overbalancing
you could be overbalancing
they could be overbalancing	I could have overbalanced
you could have overbalanced
he could have overbalanced
we could have overbalanced
you could have overbalanced
they could have overbalanced	I could have been overbalancing
you could have been overbalancing
he could have been overbalancing
we could have been overbalancing
you could have been overbalancing
they could have been overbalancing	

Negation 	
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I couldn't overbalance
you couldn't overbalance
he couldn't overbalance
we couldn't overbalance
you couldn't overbalance
they couldn't overbalance 	I couldn't be overbalancing
you couldn't be overbalancing
he couldn't be overbalancing
we couldn't be overbalancing
you couldn't be overbalancing
they couldn't be overbalancing	I couldn't have overbalanced
you couldn't have overbalanced
he couldn't have overbalanced
we couldn't have overbalanced
you couldn't have overbalanced
they couldn't have overbalanced	I couldn't have been overbalancing
you couldn't have been overbalancing
he couldn't have been overbalancing
we couldn't have been overbalancing
you couldn't have been overbalancing
they couldn't have been overbalancing	

Interrogative form 	
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could I overbalance?
could you overbalance?
could he overbalance?
could we overbalance?
could you overbalance?
could they overbalance? 	could I be overbalancing?
could you be overbalancing?
could he be overbalancing?
could we be overbalancing?
could you be overbalancing?
could they be overbalancing? 	could I have overbalanced?
could you have overbalanced?
could he have overbalanced?
could we have overbalanced?
could you have overbalanced?
could they have overbalanced? 	could I have been overbalancing?
could you have been overbalancing?
could he have been overbalancing?
could we have been overbalancing?
could you have been overbalancing?
could they have been overbalancing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I overbalance?
couldn't you overbalance?
couldn't he overbalance?
couldn't we overbalance?
couldn't you overbalance?
couldn't they overbalance? 	couldn't I be overbalancing?
couldn't you be overbalancing?
couldn't he be overbalancing?
couldn't we be overbalancing?
couldn't you be overbalancing?
couldn't they be overbalancing? 	couldn't I have overbalanced?
couldn't you have overbalanced?
couldn't he have overbalanced?
couldn't we have overbalanced?
couldn't you have overbalanced?
couldn't they have overbalanced? 	couldn't I have been overbalancing?
couldn't you have been overbalancing?
couldn't he have been overbalancing?
couldn't we have been overbalancing?
couldn't you have been overbalancing?
couldn't they have been overbalancing?