may cram
Regular verb: cram - crammed- crammed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may cram
you may cram
he may cram
we may cram
you may cram
they may cram 	I may be cramming
you may be cramming
he may be cramming
we may be cramming
you may be cramming
they may be cramming	I may have crammed
you may have crammed
he may have crammed
we may have crammed
you may have crammed
they may have crammed	I may have been cramming
you may have been cramming
he may have been cramming
we may have been cramming
you may have been cramming
they may have been cramming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't cram
you mayn't cram
he mayn't cram
we mayn't cram
you mayn't cram
they mayn't cram 	I mayn't be cramming
you mayn't be cramming
he mayn't be cramming
we mayn't be cramming
you mayn't be cramming
they mayn't be cramming	I mayn't have crammed
you mayn't have crammed
he mayn't have crammed
we mayn't have crammed
you mayn't have crammed
they mayn't have crammed	I mayn't have been cramming
you mayn't have been cramming
he mayn't have been cramming
we mayn't have been cramming
you mayn't have been cramming
they mayn't have been cramming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I cram?
may you cram?
may he cram?
may we cram?
may you cram?
may they cram? 	may I be cramming?
may you be cramming?
may he be cramming?
may we be cramming?
may you be cramming?
may they be cramming? 	may I have crammed?
may you have crammed?
may he have crammed?
may we have crammed?
may you have crammed?
may they have crammed? 	may I have been cramming?
may you have been cramming?
may he have been cramming?
may we have been cramming?
may you have been cramming?
may they have been cramming? 	

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