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