English verb conjugation
COULD SUBPOENA

Regular verb: subpoena - subpoenaed - subpoenaed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Simple form	V-ing form
I could not subpoena you could not subpoena he could not subpoena we could not subpoena you could not subpoena they could not subpoena	I could not be subpoenaing you could not be subpoenaing he could not be subpoenaing we could not be subpoenaing you could not be subpoenaing they could not be subpoenaing
Perfect	V-ing perfect
I could not have subpoenaed you could not have subpoenaed he could not have subpoenaed we could not have subpoenaed you could not have subpoenaed they could not have subpoenaed	I could not have been subpoenaing you could not have been subpoenaing he could not have been subpoenaing we could not have been subpoenaing you could not have been subpoenaing they could not have been subpoenaing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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

Simple form	V-ing form
could I not subpoena? could you not subpoena? could he not subpoena? could we not subpoena? could you not subpoena? could they not subpoena?	could I not be subpoenaing? could you not be subpoenaing? could he not be subpoenaing? could we not be subpoenaing? could you not be subpoenaing? could they not be subpoenaing?
Perfect	V-ing perfect
could I not have subpoenaed? could you not have subpoenaed? could he not have subpoenaed? could we not have subpoenaed? could you not have subpoenaed? could they not have subpoenaed?	could I not have been subpoenaing? could you not have been subpoenaing? could he not have been subpoenaing? could we not have been subpoenaing? could you not have been subpoenaing? could they not have been subpoenaing?