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