I may swim you may swim he may swim we may swim you may swim they may swim
V-ing form
I may be swimming you may be swimming he may be swimming we may be swimming you may be swimming they may be swimming
Perfect
I may have swum you may have swum he may have swum we may have swum you may have swum they may have swum
V-ing perfect
I may have been swimming you may have been swimming he may have been swimming we may have been swimming you may have been swimming they may have been swimming
Negation
Simple form
I may not swim you may not swim he may not swim we may not swim you may not swim they may not swim
V-ing form
I may not be swimming you may not be swimming he may not be swimming we may not be swimming you may not be swimming they may not be swimming
Perfect
I may not have swum you may not have swum he may not have swum we may not have swum you may not have swum they may not have swum
V-ing perfect
I may not have been swimming you may not have been swimming he may not have been swimming we may not have been swimming you may not have been swimming they may not have been swimming
Interrogative form
Simple form
may I swim? may you swim? may he swim? may we swim? may you swim? may they swim?
V-ing form
may I be swimming? may you be swimming? may he be swimming? may we be swimming? may you be swimming? may they be swimming?
Perfect
may I have swum? may you have swum? may he have swum? may we have swum? may you have swum? may they have swum?
V-ing perfect
may I have been swimming? may you have been swimming? may he have been swimming? may we have been swimming? may you have been swimming? may they have been swimming?
Interro-negative form
Simple form
may I not swim? may you not swim? may he not swim? may we not swim? may you not swim? may they not swim?
V-ing form
may I not be swimming? may you not be swimming? may he not be swimming? may we not be swimming? may you not be swimming? may they not be swimming?
Perfect
may I not have swum? may you not have swum? may he not have swum? may we not have swum? may you not have swum? may they not have swum?
V-ing perfect
may I not have been swimming? may you not have been swimming? may he not have been swimming? may we not have been swimming? may you not have been swimming? may they not have been swimming?