I can cram you can cram he can cram we can cram you can cram they can cram
V-ing form
I can be cramming you can be cramming he can be cramming we can be cramming you can be cramming they can be cramming
Perfect
I can have crammed you can have crammed he can have crammed we can have crammed you can have crammed they can have crammed
V-ing perfect
I can have been cramming you can have been cramming he can have been cramming we can have been cramming you can have been cramming they can have been cramming
Negation
Simple form
I can't cram you can't cram he can't cram we can't cram you can't cram they can't cram
V-ing form
I can't be cramming you can't be cramming he can't be cramming we can't be cramming you can't be cramming they can't be cramming
Perfect
I can't have crammed you can't have crammed he can't have crammed we can't have crammed you can't have crammed they can't have crammed
V-ing perfect
I can't have been cramming you can't have been cramming he can't have been cramming we can't have been cramming you can't have been cramming they can't have been cramming
Interrogative form
Simple form
can I cram? can you cram? can he cram? can we cram? can you cram? can they cram?
V-ing form
can I be cramming? can you be cramming? can he be cramming? can we be cramming? can you be cramming? can they be cramming?
Perfect
can I have crammed? can you have crammed? can he have crammed? can we have crammed? can you have crammed? can they have crammed?
V-ing perfect
can I have been cramming? can you have been cramming? can he have been cramming? can we have been cramming? can you have been cramming? can they have been cramming?
Interro-negative form
Simple form
can't I cram? can't you cram? can't he cram? can't we cram? can't you cram? can't they cram?
V-ing form
can't I be cramming? can't you be cramming? can't he be cramming? can't we be cramming? can't you be cramming? can't they be cramming?
Perfect
can't I have crammed? can't you have crammed? can't he have crammed? can't we have crammed? can't you have crammed? can't they have crammed?
V-ing perfect
can't I have been cramming? can't you have been cramming? can't he have been cramming? can't we have been cramming? can't you have been cramming? can't they have been cramming?