I can jam you can jam he can jam we can jam you can jam they can jam
V-ing form
I can be jamming you can be jamming he can be jamming we can be jamming you can be jamming they can be jamming
Perfect
I can have jammed you can have jammed he can have jammed we can have jammed you can have jammed they can have jammed
V-ing perfect
I can have been jamming you can have been jamming he can have been jamming we can have been jamming you can have been jamming they can have been jamming
Negation
Simple form
I can't jam you can't jam he can't jam we can't jam you can't jam they can't jam
V-ing form
I can't be jamming you can't be jamming he can't be jamming we can't be jamming you can't be jamming they can't be jamming
Perfect
I can't have jammed you can't have jammed he can't have jammed we can't have jammed you can't have jammed they can't have jammed
V-ing perfect
I can't have been jamming you can't have been jamming he can't have been jamming we can't have been jamming you can't have been jamming they can't have been jamming
Interrogative form
Simple form
can I jam? can you jam? can he jam? can we jam? can you jam? can they jam?
V-ing form
can I be jamming? can you be jamming? can he be jamming? can we be jamming? can you be jamming? can they be jamming?
Perfect
can I have jammed? can you have jammed? can he have jammed? can we have jammed? can you have jammed? can they have jammed?
V-ing perfect
can I have been jamming? can you have been jamming? can he have been jamming? can we have been jamming? can you have been jamming? can they have been jamming?
Interro-negative form
Simple form
can't I jam? can't you jam? can't he jam? can't we jam? can't you jam? can't they jam?
V-ing form
can't I be jamming? can't you be jamming? can't he be jamming? can't we be jamming? can't you be jamming? can't they be jamming?
Perfect
can't I have jammed? can't you have jammed? can't he have jammed? can't we have jammed? can't you have jammed? can't they have jammed?
V-ing perfect
can't I have been jamming? can't you have been jamming? can't he have been jamming? can't we have been jamming? can't you have been jamming? can't they have been jamming?