I may commemorate you may commemorate she may commemorate we may commemorate you may commemorate they may commemorate
V-ing form
I may be commemorating you may be commemorating she may be commemorating we may be commemorating you may be commemorating they may be commemorating
Perfect
I may have commemorated you may have commemorated she may have commemorated we may have commemorated you may have commemorated they may have commemorated
V-ing perfect
I may have been commemorating you may have been commemorating she may have been commemorating we may have been commemorating you may have been commemorating they may have been commemorating
Negation
Simple form
I mayn't commemorate you mayn't commemorate she mayn't commemorate we mayn't commemorate you mayn't commemorate they mayn't commemorate
V-ing form
I mayn't be commemorating you mayn't be commemorating she mayn't be commemorating we mayn't be commemorating you mayn't be commemorating they mayn't be commemorating
Perfect
I mayn't have commemorated you mayn't have commemorated she mayn't have commemorated we mayn't have commemorated you mayn't have commemorated they mayn't have commemorated
V-ing perfect
I mayn't have been commemorating you mayn't have been commemorating she mayn't have been commemorating we mayn't have been commemorating you mayn't have been commemorating they mayn't have been commemorating
Interrogative form
Simple form
may I commemorate? may you commemorate? may she commemorate? may we commemorate? may you commemorate? may they commemorate?
V-ing form
may I be commemorating? may you be commemorating? may she be commemorating? may we be commemorating? may you be commemorating? may they be commemorating?
Perfect
may I have commemorated? may you have commemorated? may she have commemorated? may we have commemorated? may you have commemorated? may they have commemorated?
V-ing perfect
may I have been commemorating? may you have been commemorating? may she have been commemorating? may we have been commemorating? may you have been commemorating? may they have been commemorating?
Interro-negative form
Simple form
mayn't I commemorate? mayn't you commemorate? mayn't she commemorate? mayn't we commemorate? mayn't you commemorate? mayn't they commemorate?
V-ing form
mayn't I be commemorating? mayn't you be commemorating? mayn't she be commemorating? mayn't we be commemorating? mayn't you be commemorating? mayn't they be commemorating?
Perfect
mayn't I have commemorated? mayn't you have commemorated? mayn't she have commemorated? mayn't we have commemorated? mayn't you have commemorated? mayn't they have commemorated?
V-ing perfect
mayn't I have been commemorating? mayn't you have been commemorating? mayn't she have been commemorating? mayn't we have been commemorating? mayn't you have been commemorating? mayn't they have been commemorating?