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