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