English verb conjugation
COULD PONG

Regular verb: pong - ponged - ponged

Affirmation

Simple form	V-ing form
I could pong you could pong he could pong we could pong you could pong they could pong	I could be ponging you could be ponging he could be ponging we could be ponging you could be ponging they could be ponging
Perfect	V-ing perfect
I could have ponged you could have ponged he could have ponged we could have ponged you could have ponged they could have ponged	I could have been ponging you could have been ponging he could have been ponging we could have been ponging you could have been ponging they could have been ponging

Negation

Simple form	V-ing form
I could not pong you could not pong he could not pong we could not pong you could not pong they could not pong	I could not be ponging you could not be ponging he could not be ponging we could not be ponging you could not be ponging they could not be ponging
Perfect	V-ing perfect
I could not have ponged you could not have ponged he could not have ponged we could not have ponged you could not have ponged they could not have ponged	I could not have been ponging you could not have been ponging he could not have been ponging we could not have been ponging you could not have been ponging they could not have been ponging

Interrogative form

Simple form	V-ing form
could I pong? could you pong? could he pong? could we pong? could you pong? could they pong?	could I be ponging? could you be ponging? could he be ponging? could we be ponging? could you be ponging? could they be ponging?
Perfect	V-ing perfect
could I have ponged? could you have ponged? could he have ponged? could we have ponged? could you have ponged? could they have ponged?	could I have been ponging? could you have been ponging? could he have been ponging? could we have been ponging? could you have been ponging? could they have been ponging?

Interro-negative form

Simple form	V-ing form
could I not pong? could you not pong? could he not pong? could we not pong? could you not pong? could they not pong?	could I not be ponging? could you not be ponging? could he not be ponging? could we not be ponging? could you not be ponging? could they not be ponging?
Perfect	V-ing perfect
could I not have ponged? could you not have ponged? could he not have ponged? could we not have ponged? could you not have ponged? could they not have ponged?	could I not have been ponging? could you not have been ponging? could he not have been ponging? could we not have been ponging? could you not have been ponging? could they not have been ponging?