I could bounce you could bounce he could bounce we could bounce you could bounce they could bounce
V-ing form
I could be bouncing you could be bouncing he could be bouncing we could be bouncing you could be bouncing they could be bouncing
Perfect
I could have bounced you could have bounced he could have bounced we could have bounced you could have bounced they could have bounced
V-ing perfect
I could have been bouncing you could have been bouncing he could have been bouncing we could have been bouncing you could have been bouncing they could have been bouncing
Negation
Simple form
I could not bounce you could not bounce he could not bounce we could not bounce you could not bounce they could not bounce
V-ing form
I could not be bouncing you could not be bouncing he could not be bouncing we could not be bouncing you could not be bouncing they could not be bouncing
Perfect
I could not have bounced you could not have bounced he could not have bounced we could not have bounced you could not have bounced they could not have bounced
V-ing perfect
I could not have been bouncing you could not have been bouncing he could not have been bouncing we could not have been bouncing you could not have been bouncing they could not have been bouncing
Interrogative form
Simple form
could I bounce? could you bounce? could he bounce? could we bounce? could you bounce? could they bounce?
V-ing form
could I be bouncing? could you be bouncing? could he be bouncing? could we be bouncing? could you be bouncing? could they be bouncing?
Perfect
could I have bounced? could you have bounced? could he have bounced? could we have bounced? could you have bounced? could they have bounced?
V-ing perfect
could I have been bouncing? could you have been bouncing? could he have been bouncing? could we have been bouncing? could you have been bouncing? could they have been bouncing?
Interro-negative form
Simple form
could I not bounce? could you not bounce? could he not bounce? could we not bounce? could you not bounce? could they not bounce?
V-ing form
could I not be bouncing? could you not be bouncing? could he not be bouncing? could we not be bouncing? could you not be bouncing? could they not be bouncing?
Perfect
could I not have bounced? could you not have bounced? could he not have bounced? could we not have bounced? could you not have bounced? could they not have bounced?
V-ing perfect
could I not have been bouncing? could you not have been bouncing? could he not have been bouncing? could we not have been bouncing? could you not have been bouncing? could they not have been bouncing?