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