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