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