could avouch
Regular verb: avouch - avouched- avouched

Affirmation 	
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I could avouch
you could avouch
he could avouch
we could avouch
you could avouch
they could avouch 	I could be avouching
you could be avouching
he could be avouching
we could be avouching
you could be avouching
they could be avouching	I could have avouched
you could have avouched
he could have avouched
we could have avouched
you could have avouched
they could have avouched	I could have been avouching
you could have been avouching
he could have been avouching
we could have been avouching
you could have been avouching
they could have been avouching	

Negation 	
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I couldn't avouch
you couldn't avouch
he couldn't avouch
we couldn't avouch
you couldn't avouch
they couldn't avouch 	I couldn't be avouching
you couldn't be avouching
he couldn't be avouching
we couldn't be avouching
you couldn't be avouching
they couldn't be avouching	I couldn't have avouched
you couldn't have avouched
he couldn't have avouched
we couldn't have avouched
you couldn't have avouched
they couldn't have avouched	I couldn't have been avouching
you couldn't have been avouching
he couldn't have been avouching
we couldn't have been avouching
you couldn't have been avouching
they couldn't have been avouching	

Interrogative form 	
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could I avouch?
could you avouch?
could he avouch?
could we avouch?
could you avouch?
could they avouch? 	could I be avouching?
could you be avouching?
could he be avouching?
could we be avouching?
could you be avouching?
could they be avouching? 	could I have avouched?
could you have avouched?
could he have avouched?
could we have avouched?
could you have avouched?
could they have avouched? 	could I have been avouching?
could you have been avouching?
could he have been avouching?
could we have been avouching?
could you have been avouching?
could they have been avouching? 	

Interro-negative form 	
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couldn't I avouch?
couldn't you avouch?
couldn't he avouch?
couldn't we avouch?
couldn't you avouch?
couldn't they avouch? 	couldn't I be avouching?
couldn't you be avouching?
couldn't he be avouching?
couldn't we be avouching?
couldn't you be avouching?
couldn't they be avouching? 	couldn't I have avouched?
couldn't you have avouched?
couldn't he have avouched?
couldn't we have avouched?
couldn't you have avouched?
couldn't they have avouched? 	couldn't I have been avouching?
couldn't you have been avouching?
couldn't he have been avouching?
couldn't we have been avouching?
couldn't you have been avouching?
couldn't they have been avouching?