English verb conjugation
COULD POP

Regular verb: pop - popped - popped

Affirmation

Simple form	V-ing form
I could pop you could pop he could pop we could pop you could pop they could pop	I could be popping you could be popping he could be popping we could be popping you could be popping they could be popping
Perfect	V-ing perfect
I could have popped you could have popped he could have popped we could have popped you could have popped they could have popped	I could have been popping you could have been popping he could have been popping we could have been popping you could have been popping they could have been popping

Negation

Simple form	V-ing form
I could not pop you could not pop he could not pop we could not pop you could not pop they could not pop	I could not be popping you could not be popping he could not be popping we could not be popping you could not be popping they could not be popping
Perfect	V-ing perfect
I could not have popped you could not have popped he could not have popped we could not have popped you could not have popped they could not have popped	I could not have been popping you could not have been popping he could not have been popping we could not have been popping you could not have been popping they could not have been popping

Interrogative form

Simple form	V-ing form
could I pop? could you pop? could he pop? could we pop? could you pop? could they pop?	could I be popping? could you be popping? could he be popping? could we be popping? could you be popping? could they be popping?
Perfect	V-ing perfect
could I have popped? could you have popped? could he have popped? could we have popped? could you have popped? could they have popped?	could I have been popping? could you have been popping? could he have been popping? could we have been popping? could you have been popping? could they have been popping?

Interro-negative form

Simple form	V-ing form
could I not pop? could you not pop? could he not pop? could we not pop? could you not pop? could they not pop?	could I not be popping? could you not be popping? could he not be popping? could we not be popping? could you not be popping? could they not be popping?
Perfect	V-ing perfect
could I not have popped? could you not have popped? could he not have popped? could we not have popped? could you not have popped? could they not have popped?	could I not have been popping? could you not have been popping? could he not have been popping? could we not have been popping? could you not have been popping? could they not have been popping?