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