could arbitrate
Regular verb: arbitrate - arbitrated- arbitrated

Affirmation 	
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I could arbitrate
you could arbitrate
she could arbitrate
we could arbitrate
you could arbitrate
they could arbitrate 	I could be arbitrating
you could be arbitrating
she could be arbitrating
we could be arbitrating
you could be arbitrating
they could be arbitrating	I could have arbitrated
you could have arbitrated
she could have arbitrated
we could have arbitrated
you could have arbitrated
they could have arbitrated	I could have been arbitrating
you could have been arbitrating
she could have been arbitrating
we could have been arbitrating
you could have been arbitrating
they could have been arbitrating	

Negation 	
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I couldn't arbitrate
you couldn't arbitrate
she couldn't arbitrate
we couldn't arbitrate
you couldn't arbitrate
they couldn't arbitrate 	I couldn't be arbitrating
you couldn't be arbitrating
she couldn't be arbitrating
we couldn't be arbitrating
you couldn't be arbitrating
they couldn't be arbitrating	I couldn't have arbitrated
you couldn't have arbitrated
she couldn't have arbitrated
we couldn't have arbitrated
you couldn't have arbitrated
they couldn't have arbitrated	I couldn't have been arbitrating
you couldn't have been arbitrating
she couldn't have been arbitrating
we couldn't have been arbitrating
you couldn't have been arbitrating
they couldn't have been arbitrating	

Interrogative form 	
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could I arbitrate?
could you arbitrate?
could she arbitrate?
could we arbitrate?
could you arbitrate?
could they arbitrate? 	could I be arbitrating?
could you be arbitrating?
could she be arbitrating?
could we be arbitrating?
could you be arbitrating?
could they be arbitrating? 	could I have arbitrated?
could you have arbitrated?
could she have arbitrated?
could we have arbitrated?
could you have arbitrated?
could they have arbitrated? 	could I have been arbitrating?
could you have been arbitrating?
could she have been arbitrating?
could we have been arbitrating?
could you have been arbitrating?
could they have been arbitrating? 	

Interro-negative form 	
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couldn't I arbitrate?
couldn't you arbitrate?
couldn't she arbitrate?
couldn't we arbitrate?
couldn't you arbitrate?
couldn't they arbitrate? 	couldn't I be arbitrating?
couldn't you be arbitrating?
couldn't she be arbitrating?
couldn't we be arbitrating?
couldn't you be arbitrating?
couldn't they be arbitrating? 	couldn't I have arbitrated?
couldn't you have arbitrated?
couldn't she have arbitrated?
couldn't we have arbitrated?
couldn't you have arbitrated?
couldn't they have arbitrated? 	couldn't I have been arbitrating?
couldn't you have been arbitrating?
couldn't she have been arbitrating?
couldn't we have been arbitrating?
couldn't you have been arbitrating?
couldn't they have been arbitrating?