I may join you may join he may join we may join you may join they may join
V-ing form
I may be joining you may be joining he may be joining we may be joining you may be joining they may be joining
Perfect
I may have joined you may have joined he 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 he 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 he 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 he 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 he 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 he 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 he join? may we join? may you join? may they join?
V-ing form
may I be joining? may you be joining? may he be joining? may we be joining? may you be joining? may they be joining?
Perfect
may I have joined? may you have joined? may he 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 he 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 he 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 he 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 he 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 he not have been joining? may we not have been joining? may you not have been joining? may they not have been joining?