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