I may grimace you may grimace he may grimace we may grimace you may grimace they may grimace
V-ing form
I may be grimacing you may be grimacing he may be grimacing we may be grimacing you may be grimacing they may be grimacing
Perfect
I may have grimaced you may have grimaced he may have grimaced we may have grimaced you may have grimaced they may have grimaced
V-ing perfect
I may have been grimacing you may have been grimacing he may have been grimacing we may have been grimacing you may have been grimacing they may have been grimacing
Negation
Simple form
I mayn't grimace you mayn't grimace he mayn't grimace we mayn't grimace you mayn't grimace they mayn't grimace
V-ing form
I mayn't be grimacing you mayn't be grimacing he mayn't be grimacing we mayn't be grimacing you mayn't be grimacing they mayn't be grimacing
Perfect
I mayn't have grimaced you mayn't have grimaced he mayn't have grimaced we mayn't have grimaced you mayn't have grimaced they mayn't have grimaced
V-ing perfect
I mayn't have been grimacing you mayn't have been grimacing he mayn't have been grimacing we mayn't have been grimacing you mayn't have been grimacing they mayn't have been grimacing
Interrogative form
Simple form
may I grimace? may you grimace? may he grimace? may we grimace? may you grimace? may they grimace?
V-ing form
may I be grimacing? may you be grimacing? may he be grimacing? may we be grimacing? may you be grimacing? may they be grimacing?
Perfect
may I have grimaced? may you have grimaced? may he have grimaced? may we have grimaced? may you have grimaced? may they have grimaced?
V-ing perfect
may I have been grimacing? may you have been grimacing? may he have been grimacing? may we have been grimacing? may you have been grimacing? may they have been grimacing?
Interro-negative form
Simple form
mayn't I grimace? mayn't you grimace? mayn't he grimace? mayn't we grimace? mayn't you grimace? mayn't they grimace?
V-ing form
mayn't I be grimacing? mayn't you be grimacing? mayn't he be grimacing? mayn't we be grimacing? mayn't you be grimacing? mayn't they be grimacing?
Perfect
mayn't I have grimaced? mayn't you have grimaced? mayn't he have grimaced? mayn't we have grimaced? mayn't you have grimaced? mayn't they have grimaced?
V-ing perfect
mayn't I have been grimacing? mayn't you have been grimacing? mayn't he have been grimacing? mayn't we have been grimacing? mayn't you have been grimacing? mayn't they have been grimacing?