I may forget you may forget he may forget we may forget you may forget they may forget
V-ing form
I may be forgetting you may be forgetting he may be forgetting we may be forgetting you may be forgetting they may be forgetting
Perfect
I may have forgotten you may have forgotten he 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 he 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 he 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 he 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 he 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 he 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 he forget? may we forget? may you forget? may they forget?
V-ing form
may I be forgetting? may you be forgetting? may he be forgetting? may we be forgetting? may you be forgetting? may they be forgetting?
Perfect
may I have forgotten? may you have forgotten? may he 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 he 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 he 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 he 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 he 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 he have been forgetting? mayn't we have been forgetting? mayn't you have been forgetting? mayn't they have been forgetting?