may jam
Regular verb: jam - jammed- jammed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may jam
you may jam
she may jam
we may jam
you may jam
they may jam 	I may be jamming
you may be jamming
she may be jamming
we may be jamming
you may be jamming
they may be jamming	I may have jammed
you may have jammed
she may have jammed
we may have jammed
you may have jammed
they may have jammed	I may have been jamming
you may have been jamming
she may have been jamming
we may have been jamming
you may have been jamming
they may have been jamming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't jam
you mayn't jam
she mayn't jam
we mayn't jam
you mayn't jam
they mayn't jam 	I mayn't be jamming
you mayn't be jamming
she mayn't be jamming
we mayn't be jamming
you mayn't be jamming
they mayn't be jamming	I mayn't have jammed
you mayn't have jammed
she mayn't have jammed
we mayn't have jammed
you mayn't have jammed
they mayn't have jammed	I mayn't have been jamming
you mayn't have been jamming
she mayn't have been jamming
we mayn't have been jamming
you mayn't have been jamming
they mayn't have been jamming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I jam?
may you jam?
may she jam?
may we jam?
may you jam?
may they jam? 	may I be jamming?
may you be jamming?
may she be jamming?
may we be jamming?
may you be jamming?
may they be jamming? 	may I have jammed?
may you have jammed?
may she have jammed?
may we have jammed?
may you have jammed?
may they have jammed? 	may I have been jamming?
may you have been jamming?
may she have been jamming?
may we have been jamming?
may you have been jamming?
may they have been jamming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I jam?
mayn't you jam?
mayn't she jam?
mayn't we jam?
mayn't you jam?
mayn't they jam? 	mayn't I be jamming?
mayn't you be jamming?
mayn't she be jamming?
mayn't we be jamming?
mayn't you be jamming?
mayn't they be jamming? 	mayn't I have jammed?
mayn't you have jammed?
mayn't she have jammed?
mayn't we have jammed?
mayn't you have jammed?
mayn't they have jammed? 	mayn't I have been jamming?
mayn't you have been jamming?
mayn't she have been jamming?
mayn't we have been jamming?
mayn't you have been jamming?
mayn't they have been jamming?