I could ping-pong you could ping-pong she could ping-pong we could ping-pong you could ping-pong they could ping-pong
V-ing form
I could be ping-ponging you could be ping-ponging she could be ping-ponging we could be ping-ponging you could be ping-ponging they could be ping-ponging
Perfect
I could have ping-ponged you could have ping-ponged she could have ping-ponged we could have ping-ponged you could have ping-ponged they could have ping-ponged
V-ing perfect
I could have been ping-ponging you could have been ping-ponging she could have been ping-ponging we could have been ping-ponging you could have been ping-ponging they could have been ping-ponging
Negation
Simple form
I couldn't ping-pong you couldn't ping-pong she couldn't ping-pong we couldn't ping-pong you couldn't ping-pong they couldn't ping-pong
V-ing form
I couldn't be ping-ponging you couldn't be ping-ponging she couldn't be ping-ponging we couldn't be ping-ponging you couldn't be ping-ponging they couldn't be ping-ponging
Perfect
I couldn't have ping-ponged you couldn't have ping-ponged she couldn't have ping-ponged we couldn't have ping-ponged you couldn't have ping-ponged they couldn't have ping-ponged
V-ing perfect
I couldn't have been ping-ponging you couldn't have been ping-ponging she couldn't have been ping-ponging we couldn't have been ping-ponging you couldn't have been ping-ponging they couldn't have been ping-ponging
Interrogative form
Simple form
could I ping-pong? could you ping-pong? could she ping-pong? could we ping-pong? could you ping-pong? could they ping-pong?
V-ing form
could I be ping-ponging? could you be ping-ponging? could she be ping-ponging? could we be ping-ponging? could you be ping-ponging? could they be ping-ponging?
Perfect
could I have ping-ponged? could you have ping-ponged? could she have ping-ponged? could we have ping-ponged? could you have ping-ponged? could they have ping-ponged?
V-ing perfect
could I have been ping-ponging? could you have been ping-ponging? could she have been ping-ponging? could we have been ping-ponging? could you have been ping-ponging? could they have been ping-ponging?
Interro-negative form
Simple form
couldn't I ping-pong? couldn't you ping-pong? couldn't she ping-pong? couldn't we ping-pong? couldn't you ping-pong? couldn't they ping-pong?
V-ing form
couldn't I be ping-ponging? couldn't you be ping-ponging? couldn't she be ping-ponging? couldn't we be ping-ponging? couldn't you be ping-ponging? couldn't they be ping-ponging?
Perfect
couldn't I have ping-ponged? couldn't you have ping-ponged? couldn't she have ping-ponged? couldn't we have ping-ponged? couldn't you have ping-ponged? couldn't they have ping-ponged?
V-ing perfect
couldn't I have been ping-ponging? couldn't you have been ping-ponging? couldn't she have been ping-ponging? couldn't we have been ping-ponging? couldn't you have been ping-ponging? couldn't they have been ping-ponging?