could subpoena
Regular verb: subpoena - subpoenaed- subpoenaed

Affirmation 	
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I could subpoena
you could subpoena
he could subpoena
we could subpoena
you could subpoena
they could subpoena 	I could be subpoenaing
you could be subpoenaing
he could be subpoenaing
we could be subpoenaing
you could be subpoenaing
they could be subpoenaing	I could have subpoenaed
you could have subpoenaed
he could have subpoenaed
we could have subpoenaed
you could have subpoenaed
they could have subpoenaed	I could have been subpoenaing
you could have been subpoenaing
he could have been subpoenaing
we could have been subpoenaing
you could have been subpoenaing
they could have been subpoenaing	

Negation 	
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I couldn't subpoena
you couldn't subpoena
he couldn't subpoena
we couldn't subpoena
you couldn't subpoena
they couldn't subpoena 	I couldn't be subpoenaing
you couldn't be subpoenaing
he couldn't be subpoenaing
we couldn't be subpoenaing
you couldn't be subpoenaing
they couldn't be subpoenaing	I couldn't have subpoenaed
you couldn't have subpoenaed
he couldn't have subpoenaed
we couldn't have subpoenaed
you couldn't have subpoenaed
they couldn't have subpoenaed	I couldn't have been subpoenaing
you couldn't have been subpoenaing
he couldn't have been subpoenaing
we couldn't have been subpoenaing
you couldn't have been subpoenaing
they couldn't have been subpoenaing	

Interrogative form 	
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could I subpoena?
could you subpoena?
could he subpoena?
could we subpoena?
could you subpoena?
could they subpoena? 	could I be subpoenaing?
could you be subpoenaing?
could he be subpoenaing?
could we be subpoenaing?
could you be subpoenaing?
could they be subpoenaing? 	could I have subpoenaed?
could you have subpoenaed?
could he have subpoenaed?
could we have subpoenaed?
could you have subpoenaed?
could they have subpoenaed? 	could I have been subpoenaing?
could you have been subpoenaing?
could he have been subpoenaing?
could we have been subpoenaing?
could you have been subpoenaing?
could they have been subpoenaing? 	

Interro-negative form 	
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couldn't I subpoena?
couldn't you subpoena?
couldn't he subpoena?
couldn't we subpoena?
couldn't you subpoena?
couldn't they subpoena? 	couldn't I be subpoenaing?
couldn't you be subpoenaing?
couldn't he be subpoenaing?
couldn't we be subpoenaing?
couldn't you be subpoenaing?
couldn't they be subpoenaing? 	couldn't I have subpoenaed?
couldn't you have subpoenaed?
couldn't he have subpoenaed?
couldn't we have subpoenaed?
couldn't you have subpoenaed?
couldn't they have subpoenaed? 	couldn't I have been subpoenaing?
couldn't you have been subpoenaing?
couldn't he have been subpoenaing?
couldn't we have been subpoenaing?
couldn't you have been subpoenaing?
couldn't they have been subpoenaing?