I may swim you may swim she may swim we may swim you may swim they may swim
V-ing form
I may be swimming you may be swimming she may be swimming we may be swimming you may be swimming they may be swimming
Perfect
I may have swum you may have swum she 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 she may have been swimming we may have been swimming you may have been swimming they may have been swimming
Negation
Simple form
I mayn't swim you mayn't swim she mayn't swim we mayn't swim you mayn't swim they mayn't swim
V-ing form
I mayn't be swimming you mayn't be swimming she mayn't be swimming we mayn't be swimming you mayn't be swimming they mayn't be swimming
Perfect
I mayn't have swum you mayn't have swum she mayn't have swum we mayn't have swum you mayn't have swum they mayn't have swum
V-ing perfect
I mayn't have been swimming you mayn't have been swimming she mayn't have been swimming we mayn't have been swimming you mayn't have been swimming they mayn't have been swimming
Interrogative form
Simple form
may I swim? may you swim? may she swim? may we swim? may you swim? may they swim?
V-ing form
may I be swimming? may you be swimming? may she be swimming? may we be swimming? may you be swimming? may they be swimming?
Perfect
may I have swum? may you have swum? may she 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 she have been swimming? may we have been swimming? may you have been swimming? may they have been swimming?
Interro-negative form
Simple form
mayn't I swim? mayn't you swim? mayn't she swim? mayn't we swim? mayn't you swim? mayn't they swim?
V-ing form
mayn't I be swimming? mayn't you be swimming? mayn't she be swimming? mayn't we be swimming? mayn't you be swimming? mayn't they be swimming?
Perfect
mayn't I have swum? mayn't you have swum? mayn't she have swum? mayn't we have swum? mayn't you have swum? mayn't they have swum?
V-ing perfect
mayn't I have been swimming? mayn't you have been swimming? mayn't she have been swimming? mayn't we have been swimming? mayn't you have been swimming? mayn't they have been swimming?