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