I could swarm you could swarm she could swarm we could swarm you could swarm they could swarm
V-ing form
I could be swarming you could be swarming she could be swarming we could be swarming you could be swarming they could be swarming
Perfect
I could have swarmed you could have swarmed she could have swarmed we could have swarmed you could have swarmed they could have swarmed
V-ing perfect
I could have been swarming you could have been swarming she could have been swarming we could have been swarming you could have been swarming they could have been swarming
Negation
Simple form
I could not swarm you could not swarm she could not swarm we could not swarm you could not swarm they could not swarm
V-ing form
I could not be swarming you could not be swarming she could not be swarming we could not be swarming you could not be swarming they could not be swarming
Perfect
I could not have swarmed you could not have swarmed she could not have swarmed we could not have swarmed you could not have swarmed they could not have swarmed
V-ing perfect
I could not have been swarming you could not have been swarming she could not have been swarming we could not have been swarming you could not have been swarming they could not have been swarming
Interrogative form
Simple form
could I swarm? could you swarm? could she swarm? could we swarm? could you swarm? could they swarm?
V-ing form
could I be swarming? could you be swarming? could she be swarming? could we be swarming? could you be swarming? could they be swarming?
Perfect
could I have swarmed? could you have swarmed? could she have swarmed? could we have swarmed? could you have swarmed? could they have swarmed?
V-ing perfect
could I have been swarming? could you have been swarming? could she have been swarming? could we have been swarming? could you have been swarming? could they have been swarming?
Interro-negative form
Simple form
could I not swarm? could you not swarm? could she not swarm? could we not swarm? could you not swarm? could they not swarm?
V-ing form
could I not be swarming? could you not be swarming? could she not be swarming? could we not be swarming? could you not be swarming? could they not be swarming?
Perfect
could I not have swarmed? could you not have swarmed? could she not have swarmed? could we not have swarmed? could you not have swarmed? could they not have swarmed?
V-ing perfect
could I not have been swarming? could you not have been swarming? could she not have been swarming? could we not have been swarming? could you not have been swarming? could they not have been swarming?