I may join you may join she may join we may join you may join they may join
V-ing form
I may be joining you may be joining she may be joining we may be joining you may be joining they may be joining
Perfect
I may have joined you may have joined she may have joined we may have joined you may have joined they may have joined
V-ing perfect
I may have been joining you may have been joining she may have been joining we may have been joining you may have been joining they may have been joining
Negation
Simple form
I may not join you may not join she may not join we may not join you may not join they may not join
V-ing form
I may not be joining you may not be joining she may not be joining we may not be joining you may not be joining they may not be joining
Perfect
I may not have joined you may not have joined she may not have joined we may not have joined you may not have joined they may not have joined
V-ing perfect
I may not have been joining you may not have been joining she may not have been joining we may not have been joining you may not have been joining they may not have been joining
Interrogative form
Simple form
may I join? may you join? may she join? may we join? may you join? may they join?
V-ing form
may I be joining? may you be joining? may she be joining? may we be joining? may you be joining? may they be joining?
Perfect
may I have joined? may you have joined? may she have joined? may we have joined? may you have joined? may they have joined?
V-ing perfect
may I have been joining? may you have been joining? may she have been joining? may we have been joining? may you have been joining? may they have been joining?
Interro-negative form
Simple form
may I not join? may you not join? may she not join? may we not join? may you not join? may they not join?
V-ing form
may I not be joining? may you not be joining? may she not be joining? may we not be joining? may you not be joining? may they not be joining?
Perfect
may I not have joined? may you not have joined? may she not have joined? may we not have joined? may you not have joined? may they not have joined?
V-ing perfect
may I not have been joining? may you not have been joining? may she not have been joining? may we not have been joining? may you not have been joining? may they not have been joining?