can jam
Regular verb: jam - jammed- jammed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can jam
you can jam
she can jam
we can jam
you can jam
they can jam 	I can be jamming
you can be jamming
she can be jamming
we can be jamming
you can be jamming
they can be jamming	I can have jammed
you can have jammed
she can have jammed
we can have jammed
you can have jammed
they can have jammed	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 	V-ing form 	Perfect 	V-ing perfect 	
I cannot jam
you cannot jam
she cannot jam
we cannot jam
you cannot jam
they cannot jam 	I cannot be jamming
you cannot be jamming
she cannot be jamming
we cannot be jamming
you cannot be jamming
they cannot be jamming	I cannot have jammed
you cannot have jammed
she cannot have jammed
we cannot have jammed
you cannot have jammed
they cannot have jammed	I cannot have been jamming
you cannot have been jamming
she cannot have been jamming
we cannot have been jamming
you cannot have been jamming
they cannot have been jamming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I jam?
can you jam?
can she jam?
can we jam?
can you jam?
can they jam? 	can I be jamming?
can you be jamming?
can she be jamming?
can we be jamming?
can you be jamming?
can they be jamming? 	can I have jammed?
can you have jammed?
can she have jammed?
can we have jammed?
can you have jammed?
can they have jammed? 	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 	V-ing form 	Perfect 	V-ing perfect 	
can I not jam?
can you not jam?
can she not jam?
can we not jam?
can you not jam?
can they not jam? 	can I not be jamming?
can you not be jamming?
can she not be jamming?
can we not be jamming?
can you not be jamming?
can they not be jamming? 	can I not have jammed?
can you not have jammed?
can she not have jammed?
can we not have jammed?
can you not have jammed?
can they not have jammed? 	can I not have been jamming?
can you not have been jamming?
can she not have been jamming?
can we not have been jamming?
can you not have been jamming?
can they not have been jamming?