I may shift you may shift he may shift we may shift you may shift they may shift
V-ing form
I may be shifting you may be shifting he may be shifting we may be shifting you may be shifting they may be shifting
Perfect
I may have shifted you may have shifted he may have shifted we may have shifted you may have shifted they may have shifted
V-ing perfect
I may have been shifting you may have been shifting he may have been shifting we may have been shifting you may have been shifting they may have been shifting
Negation
Simple form
I mayn't shift you mayn't shift he mayn't shift we mayn't shift you mayn't shift they mayn't shift
V-ing form
I mayn't be shifting you mayn't be shifting he mayn't be shifting we mayn't be shifting you mayn't be shifting they mayn't be shifting
Perfect
I mayn't have shifted you mayn't have shifted he mayn't have shifted we mayn't have shifted you mayn't have shifted they mayn't have shifted
V-ing perfect
I mayn't have been shifting you mayn't have been shifting he mayn't have been shifting we mayn't have been shifting you mayn't have been shifting they mayn't have been shifting
Interrogative form
Simple form
may I shift? may you shift? may he shift? may we shift? may you shift? may they shift?
V-ing form
may I be shifting? may you be shifting? may he be shifting? may we be shifting? may you be shifting? may they be shifting?
Perfect
may I have shifted? may you have shifted? may he have shifted? may we have shifted? may you have shifted? may they have shifted?
V-ing perfect
may I have been shifting? may you have been shifting? may he have been shifting? may we have been shifting? may you have been shifting? may they have been shifting?
Interro-negative form
Simple form
mayn't I shift? mayn't you shift? mayn't he shift? mayn't we shift? mayn't you shift? mayn't they shift?
V-ing form
mayn't I be shifting? mayn't you be shifting? mayn't he be shifting? mayn't we be shifting? mayn't you be shifting? mayn't they be shifting?
Perfect
mayn't I have shifted? mayn't you have shifted? mayn't he have shifted? mayn't we have shifted? mayn't you have shifted? mayn't they have shifted?
V-ing perfect
mayn't I have been shifting? mayn't you have been shifting? mayn't he have been shifting? mayn't we have been shifting? mayn't you have been shifting? mayn't they have been shifting?