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