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 can't swarm you can't swarm he can't swarm we can't swarm you can't swarm they can't swarm
V-ing form
I can't be swarming you can't be swarming he can't be swarming we can't be swarming you can't be swarming they can't be swarming
Perfect
I can't have swarmed you can't have swarmed he can't have swarmed we can't have swarmed you can't have swarmed they can't have swarmed
V-ing perfect
I can't have been swarming you can't have been swarming he can't have been swarming we can't have been swarming you can't have been swarming they can't 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't I swarm? can't you swarm? can't he swarm? can't we swarm? can't you swarm? can't they swarm?
V-ing form
can't I be swarming? can't you be swarming? can't he be swarming? can't we be swarming? can't you be swarming? can't they be swarming?
Perfect
can't I have swarmed? can't you have swarmed? can't he have swarmed? can't we have swarmed? can't you have swarmed? can't they have swarmed?
V-ing perfect
can't I have been swarming? can't you have been swarming? can't he have been swarming? can't we have been swarming? can't you have been swarming? can't they have been swarming?