I could blip you could blip he could blip we could blip you could blip they could blip
V-ing form
I could be bliping you could be bliping he could be bliping we could be bliping you could be bliping they could be bliping
Perfect
I could have bliped you could have bliped he could have bliped we could have bliped you could have bliped they could have bliped
V-ing perfect
I could have been bliping you could have been bliping he could have been bliping we could have been bliping you could have been bliping they could have been bliping
Negation
Simple form
I could not blip you could not blip he could not blip we could not blip you could not blip they could not blip
V-ing form
I could not be bliping you could not be bliping he could not be bliping we could not be bliping you could not be bliping they could not be bliping
Perfect
I could not have bliped you could not have bliped he could not have bliped we could not have bliped you could not have bliped they could not have bliped
V-ing perfect
I could not have been bliping you could not have been bliping he could not have been bliping we could not have been bliping you could not have been bliping they could not have been bliping
Interrogative form
Simple form
could I blip? could you blip? could he blip? could we blip? could you blip? could they blip?
V-ing form
could I be bliping? could you be bliping? could he be bliping? could we be bliping? could you be bliping? could they be bliping?
Perfect
could I have bliped? could you have bliped? could he have bliped? could we have bliped? could you have bliped? could they have bliped?
V-ing perfect
could I have been bliping? could you have been bliping? could he have been bliping? could we have been bliping? could you have been bliping? could they have been bliping?
Interro-negative form
Simple form
could I not blip? could you not blip? could he not blip? could we not blip? could you not blip? could they not blip?
V-ing form
could I not be bliping? could you not be bliping? could he not be bliping? could we not be bliping? could you not be bliping? could they not be bliping?
Perfect
could I not have bliped? could you not have bliped? could he not have bliped? could we not have bliped? could you not have bliped? could they not have bliped?
V-ing perfect
could I not have been bliping? could you not have been bliping? could he not have been bliping? could we not have been bliping? could you not have been bliping? could they not have been bliping?