I could speed you could speed she could speed we could speed you could speed they could speed
V-ing form
I could be speeding you could be speeding she could be speeding we could be speeding you could be speeding they could be speeding
Perfect
I could have sped you could have sped she could have sped we could have sped you could have sped they could have sped
V-ing perfect
I could have been speeding you could have been speeding she could have been speeding we could have been speeding you could have been speeding they could have been speeding
Negation
Simple form
I could not speed you could not speed she could not speed we could not speed you could not speed they could not speed
V-ing form
I could not be speeding you could not be speeding she could not be speeding we could not be speeding you could not be speeding they could not be speeding
Perfect
I could not have sped you could not have sped she could not have sped we could not have sped you could not have sped they could not have sped
V-ing perfect
I could not have been speeding you could not have been speeding she could not have been speeding we could not have been speeding you could not have been speeding they could not have been speeding
Interrogative form
Simple form
could I speed? could you speed? could she speed? could we speed? could you speed? could they speed?
V-ing form
could I be speeding? could you be speeding? could she be speeding? could we be speeding? could you be speeding? could they be speeding?
Perfect
could I have sped? could you have sped? could she have sped? could we have sped? could you have sped? could they have sped?
V-ing perfect
could I have been speeding? could you have been speeding? could she have been speeding? could we have been speeding? could you have been speeding? could they have been speeding?
Interro-negative form
Simple form
could I not speed? could you not speed? could she not speed? could we not speed? could you not speed? could they not speed?
V-ing form
could I not be speeding? could you not be speeding? could she not be speeding? could we not be speeding? could you not be speeding? could they not be speeding?
Perfect
could I not have sped? could you not have sped? could she not have sped? could we not have sped? could you not have sped? could they not have sped?
V-ing perfect
could I not have been speeding? could you not have been speeding? could she not have been speeding? could we not have been speeding? could you not have been speeding? could they not have been speeding?