English verb conjugation
COULD SUBSCRIBE

Regular verb: subscribe - subscribed - subscribed

Affirmation

Simple form	V-ing form
I could subscribe you could subscribe he could subscribe we could subscribe you could subscribe they could subscribe	I could be subscribing you could be subscribing he could be subscribing we could be subscribing you could be subscribing they could be subscribing
Perfect	V-ing perfect
I could have subscribed you could have subscribed he could have subscribed we could have subscribed you could have subscribed they could have subscribed	I could have been subscribing you could have been subscribing he could have been subscribing we could have been subscribing you could have been subscribing they could have been subscribing

Negation

Simple form	V-ing form
I could not subscribe you could not subscribe he could not subscribe we could not subscribe you could not subscribe they could not subscribe	I could not be subscribing you could not be subscribing he could not be subscribing we could not be subscribing you could not be subscribing they could not be subscribing
Perfect	V-ing perfect
I could not have subscribed you could not have subscribed he could not have subscribed we could not have subscribed you could not have subscribed they could not have subscribed	I could not have been subscribing you could not have been subscribing he could not have been subscribing we could not have been subscribing you could not have been subscribing they could not have been subscribing

Interrogative form

Simple form	V-ing form
could I subscribe? could you subscribe? could he subscribe? could we subscribe? could you subscribe? could they subscribe?	could I be subscribing? could you be subscribing? could he be subscribing? could we be subscribing? could you be subscribing? could they be subscribing?
Perfect	V-ing perfect
could I have subscribed? could you have subscribed? could he have subscribed? could we have subscribed? could you have subscribed? could they have subscribed?	could I have been subscribing? could you have been subscribing? could he have been subscribing? could we have been subscribing? could you have been subscribing? could they have been subscribing?

Interro-negative form

Simple form	V-ing form
could I not subscribe? could you not subscribe? could he not subscribe? could we not subscribe? could you not subscribe? could they not subscribe?	could I not be subscribing? could you not be subscribing? could he not be subscribing? could we not be subscribing? could you not be subscribing? could they not be subscribing?
Perfect	V-ing perfect
could I not have subscribed? could you not have subscribed? could he not have subscribed? could we not have subscribed? could you not have subscribed? could they not have subscribed?	could I not have been subscribing? could you not have been subscribing? could he not have been subscribing? could we not have been subscribing? could you not have been subscribing? could they not have been subscribing?