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