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