may mass
Regular verb: mass - massed- massed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may mass
you may mass
he may mass
we may mass
you may mass
they may mass 	I may be massing
you may be massing
he may be massing
we may be massing
you may be massing
they may be massing	I may have massed
you may have massed
he may have massed
we may have massed
you may have massed
they may have massed	I may have been massing
you may have been massing
he may have been massing
we may have been massing
you may have been massing
they may have been massing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't mass
you mayn't mass
he mayn't mass
we mayn't mass
you mayn't mass
they mayn't mass 	I mayn't be massing
you mayn't be massing
he mayn't be massing
we mayn't be massing
you mayn't be massing
they mayn't be massing	I mayn't have massed
you mayn't have massed
he mayn't have massed
we mayn't have massed
you mayn't have massed
they mayn't have massed	I mayn't have been massing
you mayn't have been massing
he mayn't have been massing
we mayn't have been massing
you mayn't have been massing
they mayn't have been massing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I mass?
may you mass?
may he mass?
may we mass?
may you mass?
may they mass? 	may I be massing?
may you be massing?
may he be massing?
may we be massing?
may you be massing?
may they be massing? 	may I have massed?
may you have massed?
may he have massed?
may we have massed?
may you have massed?
may they have massed? 	may I have been massing?
may you have been massing?
may he have been massing?
may we have been massing?
may you have been massing?
may they have been massing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I mass?
mayn't you mass?
mayn't he mass?
mayn't we mass?
mayn't you mass?
mayn't they mass? 	mayn't I be massing?
mayn't you be massing?
mayn't he be massing?
mayn't we be massing?
mayn't you be massing?
mayn't they be massing? 	mayn't I have massed?
mayn't you have massed?
mayn't he have massed?
mayn't we have massed?
mayn't you have massed?
mayn't they have massed? 	mayn't I have been massing?
mayn't you have been massing?
mayn't he have been massing?
mayn't we have been massing?
mayn't you have been massing?
mayn't they have been massing?