English verb conjugation
MAY STIFF

Regular verb: stiff - stiffed - stiffed

Affirmation

Simple form	V-ing form
I may stiff you may stiff he may stiff we may stiff you may stiff they may stiff	I may be stiffing you may be stiffing he may be stiffing we may be stiffing you may be stiffing they may be stiffing
Perfect	V-ing perfect
I may have stiffed you may have stiffed he may have stiffed we may have stiffed you may have stiffed they may have stiffed	I may have been stiffing you may have been stiffing he may have been stiffing we may have been stiffing you may have been stiffing they may have been stiffing

Negation

Simple form	V-ing form
I may not stiff you may not stiff he may not stiff we may not stiff you may not stiff they may not stiff	I may not be stiffing you may not be stiffing he may not be stiffing we may not be stiffing you may not be stiffing they may not be stiffing
Perfect	V-ing perfect
I may not have stiffed you may not have stiffed he may not have stiffed we may not have stiffed you may not have stiffed they may not have stiffed	I may not have been stiffing you may not have been stiffing he may not have been stiffing we may not have been stiffing you may not have been stiffing they may not have been stiffing

Interrogative form

Simple form	V-ing form
may I stiff? may you stiff? may he stiff? may we stiff? may you stiff? may they stiff?	may I be stiffing? may you be stiffing? may he be stiffing? may we be stiffing? may you be stiffing? may they be stiffing?
Perfect	V-ing perfect
may I have stiffed? may you have stiffed? may he have stiffed? may we have stiffed? may you have stiffed? may they have stiffed?	may I have been stiffing? may you have been stiffing? may he have been stiffing? may we have been stiffing? may you have been stiffing? may they have been stiffing?

Interro-negative form

Simple form	V-ing form
may I not stiff? may you not stiff? may he not stiff? may we not stiff? may you not stiff? may they not stiff?	may I not be stiffing? may you not be stiffing? may he not be stiffing? may we not be stiffing? may you not be stiffing? may they not be stiffing?
Perfect	V-ing perfect
may I not have stiffed? may you not have stiffed? may he not have stiffed? may we not have stiffed? may you not have stiffed? may they not have stiffed?	may I not have been stiffing? may you not have been stiffing? may he not have been stiffing? may we not have been stiffing? may you not have been stiffing? may they not have been stiffing?