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