I may intervene you may intervene she may intervene we may intervene you may intervene they may intervene
V-ing form
I may be intervening you may be intervening she may be intervening we may be intervening you may be intervening they may be intervening
Perfect
I may have intervened you may have intervened she may have intervened we may have intervened you may have intervened they may have intervened
V-ing perfect
I may have been intervening you may have been intervening she may have been intervening we may have been intervening you may have been intervening they may have been intervening
Negation
Simple form
I mayn't intervene you mayn't intervene she mayn't intervene we mayn't intervene you mayn't intervene they mayn't intervene
V-ing form
I mayn't be intervening you mayn't be intervening she mayn't be intervening we mayn't be intervening you mayn't be intervening they mayn't be intervening
Perfect
I mayn't have intervened you mayn't have intervened she mayn't have intervened we mayn't have intervened you mayn't have intervened they mayn't have intervened
V-ing perfect
I mayn't have been intervening you mayn't have been intervening she mayn't have been intervening we mayn't have been intervening you mayn't have been intervening they mayn't have been intervening
Interrogative form
Simple form
may I intervene? may you intervene? may she intervene? may we intervene? may you intervene? may they intervene?
V-ing form
may I be intervening? may you be intervening? may she be intervening? may we be intervening? may you be intervening? may they be intervening?
Perfect
may I have intervened? may you have intervened? may she have intervened? may we have intervened? may you have intervened? may they have intervened?
V-ing perfect
may I have been intervening? may you have been intervening? may she have been intervening? may we have been intervening? may you have been intervening? may they have been intervening?
Interro-negative form
Simple form
mayn't I intervene? mayn't you intervene? mayn't she intervene? mayn't we intervene? mayn't you intervene? mayn't they intervene?
V-ing form
mayn't I be intervening? mayn't you be intervening? mayn't she be intervening? mayn't we be intervening? mayn't you be intervening? mayn't they be intervening?
Perfect
mayn't I have intervened? mayn't you have intervened? mayn't she have intervened? mayn't we have intervened? mayn't you have intervened? mayn't they have intervened?
V-ing perfect
mayn't I have been intervening? mayn't you have been intervening? mayn't she have been intervening? mayn't we have been intervening? mayn't you have been intervening? mayn't they have been intervening?