may commence
Regular verb: commence - commenced- commenced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may commence
you may commence
he may commence
we may commence
you may commence
they may commence 	I may be commencing
you may be commencing
he may be commencing
we may be commencing
you may be commencing
they may be commencing	I may have commenced
you may have commenced
he may have commenced
we may have commenced
you may have commenced
they may have commenced	I may have been commencing
you may have been commencing
he may have been commencing
we may have been commencing
you may have been commencing
they may have been commencing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't commence
you mayn't commence
he mayn't commence
we mayn't commence
you mayn't commence
they mayn't commence 	I mayn't be commencing
you mayn't be commencing
he mayn't be commencing
we mayn't be commencing
you mayn't be commencing
they mayn't be commencing	I mayn't have commenced
you mayn't have commenced
he mayn't have commenced
we mayn't have commenced
you mayn't have commenced
they mayn't have commenced	I mayn't have been commencing
you mayn't have been commencing
he mayn't have been commencing
we mayn't have been commencing
you mayn't have been commencing
they mayn't have been commencing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I commence?
may you commence?
may he commence?
may we commence?
may you commence?
may they commence? 	may I be commencing?
may you be commencing?
may he be commencing?
may we be commencing?
may you be commencing?
may they be commencing? 	may I have commenced?
may you have commenced?
may he have commenced?
may we have commenced?
may you have commenced?
may they have commenced? 	may I have been commencing?
may you have been commencing?
may he have been commencing?
may we have been commencing?
may you have been commencing?
may they have been commencing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I commence?
mayn't you commence?
mayn't he commence?
mayn't we commence?
mayn't you commence?
mayn't they commence? 	mayn't I be commencing?
mayn't you be commencing?
mayn't he be commencing?
mayn't we be commencing?
mayn't you be commencing?
mayn't they be commencing? 	mayn't I have commenced?
mayn't you have commenced?
mayn't he have commenced?
mayn't we have commenced?
mayn't you have commenced?
mayn't they have commenced? 	mayn't I have been commencing?
mayn't you have been commencing?
mayn't he have been commencing?
mayn't we have been commencing?
mayn't you have been commencing?
mayn't they have been commencing?