I can jam you can jam she can jam we can jam you can jam they can jam
V-ing form
I can be jamming you can be jamming she can be jamming we can be jamming you can be jamming they can be jamming
Perfect
I can have jammed you can have jammed she 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 she 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 she 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 she 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 she 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 she 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 she jam? can we jam? can you jam? can they jam?
V-ing form
can I be jamming? can you be jamming? can she be jamming? can we be jamming? can you be jamming? can they be jamming?
Perfect
can I have jammed? can you have jammed? can she 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 she 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 she 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 she 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 she 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 she have been jamming? can't we have been jamming? can't you have been jamming? can't they have been jamming?