English verb conjugation
MAY TIGHTEN

Regular verb: tighten - tightened - tightened

Affirmation

Simple form	V-ing form
I may tighten you may tighten she may tighten we may tighten you may tighten they may tighten	I may be tightening you may be tightening she may be tightening we may be tightening you may be tightening they may be tightening
Perfect	V-ing perfect
I may have tightened you may have tightened she may have tightened we may have tightened you may have tightened they may have tightened	I may have been tightening you may have been tightening she may have been tightening we may have been tightening you may have been tightening they may have been tightening

Negation

Simple form	V-ing form
I mayn't tighten you mayn't tighten she mayn't tighten we mayn't tighten you mayn't tighten they mayn't tighten	I mayn't be tightening you mayn't be tightening she mayn't be tightening we mayn't be tightening you mayn't be tightening they mayn't be tightening
Perfect	V-ing perfect
I mayn't have tightened you mayn't have tightened she mayn't have tightened we mayn't have tightened you mayn't have tightened they mayn't have tightened	I mayn't have been tightening you mayn't have been tightening she 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	V-ing form
may I tighten? may you tighten? may she tighten? may we tighten? may you tighten? may they tighten?	may I be tightening? may you be tightening? may she be tightening? may we be tightening? may you be tightening? may they be tightening?
Perfect	V-ing perfect
may I have tightened? may you have tightened? may she have tightened? may we have tightened? may you have tightened? may they have tightened?	may I have been tightening? may you have been tightening? may she have been tightening? may we have been tightening? may you have been tightening? may they have been tightening?

Interro-negative form

Simple form	V-ing form
mayn't I tighten? mayn't you tighten? mayn't she tighten? mayn't we tighten? mayn't you tighten? mayn't they tighten?	mayn't I be tightening? mayn't you be tightening? mayn't she be tightening? mayn't we be tightening? mayn't you be tightening? mayn't they be tightening?
Perfect	V-ing perfect
mayn't I have tightened? mayn't you have tightened? mayn't she have tightened? mayn't we have tightened? mayn't you have tightened? mayn't they have tightened?	mayn't I have been tightening? mayn't you have been tightening? mayn't she have been tightening? mayn't we have been tightening? mayn't you have been tightening? mayn't they have been tightening?