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