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