I may brief you may brief she may brief we may brief you may brief they may brief
V-ing form
I may be briefing you may be briefing she may be briefing we may be briefing you may be briefing they may be briefing
Perfect
I may have briefed you may have briefed she 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 she may have been briefing we may have been briefing you may have been briefing they may have been briefing
Negation
Simple form
I may not brief you may not brief she may not brief we may not brief you may not brief they may not brief
V-ing form
I may not be briefing you may not be briefing she may not be briefing we may not be briefing you may not be briefing they may not be briefing
Perfect
I may not have briefed you may not have briefed she may not have briefed we may not have briefed you may not have briefed they may not have briefed
V-ing perfect
I may not have been briefing you may not have been briefing she may not have been briefing we may not have been briefing you may not have been briefing they may not have been briefing
Interrogative form
Simple form
may I brief? may you brief? may she brief? may we brief? may you brief? may they brief?
V-ing form
may I be briefing? may you be briefing? may she be briefing? may we be briefing? may you be briefing? may they be briefing?
Perfect
may I have briefed? may you have briefed? may she 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 she have been briefing? may we have been briefing? may you have been briefing? may they have been briefing?
Interro-negative form
Simple form
may I not brief? may you not brief? may she not brief? may we not brief? may you not brief? may they not brief?
V-ing form
may I not be briefing? may you not be briefing? may she not be briefing? may we not be briefing? may you not be briefing? may they not be briefing?
Perfect
may I not have briefed? may you not have briefed? may she not have briefed? may we not have briefed? may you not have briefed? may they not have briefed?
V-ing perfect
may I not have been briefing? may you not have been briefing? may she not have been briefing? may we not have been briefing? may you not have been briefing? may they not have been briefing?