I may birl you may birl she may birl we may birl you may birl they may birl
V-ing form
I may be birling you may be birling she may be birling we may be birling you may be birling they may be birling
Perfect
I may have birled you may have birled she may have birled we may have birled you may have birled they may have birled
V-ing perfect
I may have been birling you may have been birling she may have been birling we may have been birling you may have been birling they may have been birling
Negation
Simple form
I mayn't birl you mayn't birl she mayn't birl we mayn't birl you mayn't birl they mayn't birl
V-ing form
I mayn't be birling you mayn't be birling she mayn't be birling we mayn't be birling you mayn't be birling they mayn't be birling
Perfect
I mayn't have birled you mayn't have birled she mayn't have birled we mayn't have birled you mayn't have birled they mayn't have birled
V-ing perfect
I mayn't have been birling you mayn't have been birling she mayn't have been birling we mayn't have been birling you mayn't have been birling they mayn't have been birling
Interrogative form
Simple form
may I birl? may you birl? may she birl? may we birl? may you birl? may they birl?
V-ing form
may I be birling? may you be birling? may she be birling? may we be birling? may you be birling? may they be birling?
Perfect
may I have birled? may you have birled? may she have birled? may we have birled? may you have birled? may they have birled?
V-ing perfect
may I have been birling? may you have been birling? may she have been birling? may we have been birling? may you have been birling? may they have been birling?
Interro-negative form
Simple form
mayn't I birl? mayn't you birl? mayn't she birl? mayn't we birl? mayn't you birl? mayn't they birl?
V-ing form
mayn't I be birling? mayn't you be birling? mayn't she be birling? mayn't we be birling? mayn't you be birling? mayn't they be birling?
Perfect
mayn't I have birled? mayn't you have birled? mayn't she have birled? mayn't we have birled? mayn't you have birled? mayn't they have birled?
V-ing perfect
mayn't I have been birling? mayn't you have been birling? mayn't she have been birling? mayn't we have been birling? mayn't you have been birling? mayn't they have been birling?