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 couldn't pong you couldn't pong he couldn't pong we couldn't pong you couldn't pong they couldn't pong	I couldn't be ponging you couldn't be ponging he couldn't be ponging we couldn't be ponging you couldn't be ponging they couldn't be ponging
Perfect	V-ing perfect
I couldn't have ponged you couldn't have ponged he couldn't have ponged we couldn't have ponged you couldn't have ponged they couldn't have ponged	I couldn't have been ponging you couldn't have been ponging he couldn't have been ponging we couldn't have been ponging you couldn't have been ponging they couldn't 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
couldn't I pong? couldn't you pong? couldn't he pong? couldn't we pong? couldn't you pong? couldn't they pong?	couldn't I be ponging? couldn't you be ponging? couldn't he be ponging? couldn't we be ponging? couldn't you be ponging? couldn't they be ponging?
Perfect	V-ing perfect
couldn't I have ponged? couldn't you have ponged? couldn't he have ponged? couldn't we have ponged? couldn't you have ponged? couldn't they have ponged?	couldn't I have been ponging? couldn't you have been ponging? couldn't he have been ponging? couldn't we have been ponging? couldn't you have been ponging? couldn't they have been ponging?