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 may not mass
you may not mass
he may not mass
we may not mass
you may not mass
they may not mass 	I may not be massing
you may not be massing
he may not be massing
we may not be massing
you may not be massing
they may not be massing	I may not have massed
you may not have massed
he may not have massed
we may not have massed
you may not have massed
they may not have massed	I may not have been massing
you may not have been massing
he may not have been massing
we may not have been massing
you may not have been massing
they may not 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 	
may I not mass?
may you not mass?
may he not mass?
may we not mass?
may you not mass?
may they not mass? 	may I not be massing?
may you not be massing?
may he not be massing?
may we not be massing?
may you not be massing?
may they not be massing? 	may I not have massed?
may you not have massed?
may he not have massed?
may we not have massed?
may you not have massed?
may they not have massed? 	may I not have been massing?
may you not have been massing?
may he not have been massing?
may we not have been massing?
may you not have been massing?
may they not have been massing?