English verb conjugation
MAY STIFF

Regular verb: stiff - stiffed - stiffed

Affirmation

Simple form	V-ing form
I may stiff you may stiff she may stiff we may stiff you may stiff they may stiff	I may be stiffing you may be stiffing she 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 she 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 she 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 mayn't stiff you mayn't stiff she mayn't stiff we mayn't stiff you mayn't stiff they mayn't stiff	I mayn't be stiffing you mayn't be stiffing she mayn't be stiffing we mayn't be stiffing you mayn't be stiffing they mayn't be stiffing
Perfect	V-ing perfect
I mayn't have stiffed you mayn't have stiffed she mayn't have stiffed we mayn't have stiffed you mayn't have stiffed they mayn't have stiffed	I mayn't have been stiffing you mayn't have been stiffing she mayn't have been stiffing we mayn't have been stiffing you mayn't have been stiffing they mayn't have been stiffing

Interrogative form

Simple form	V-ing form
may I stiff? may you stiff? may she stiff? may we stiff? may you stiff? may they stiff?	may I be stiffing? may you be stiffing? may she 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 she 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 she 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
mayn't I stiff? mayn't you stiff? mayn't she stiff? mayn't we stiff? mayn't you stiff? mayn't they stiff?	mayn't I be stiffing? mayn't you be stiffing? mayn't she be stiffing? mayn't we be stiffing? mayn't you be stiffing? mayn't they be stiffing?
Perfect	V-ing perfect
mayn't I have stiffed? mayn't you have stiffed? mayn't she have stiffed? mayn't we have stiffed? mayn't you have stiffed? mayn't they have stiffed?	mayn't I have been stiffing? mayn't you have been stiffing? mayn't she have been stiffing? mayn't we have been stiffing? mayn't you have been stiffing? mayn't they have been stiffing?