English verb conjugation
MAY MASS

Regular verb: mass - massed - massed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?