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