may concertina
Regular verb: concertina - concertinaed- concertinaed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may concertina
you may concertina
he may concertina
we may concertina
you may concertina
they may concertina 	I may be concertinaing
you may be concertinaing
he may be concertinaing
we may be concertinaing
you may be concertinaing
they may be concertinaing	I may have concertinaed
you may have concertinaed
he may have concertinaed
we may have concertinaed
you may have concertinaed
they may have concertinaed	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 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't concertina
you mayn't concertina
he mayn't concertina
we mayn't concertina
you mayn't concertina
they mayn't concertina 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
may I concertina?
may you concertina?
may he concertina?
may we concertina?
may you concertina?
may they concertina? 	may I be concertinaing?
may you be concertinaing?
may he be concertinaing?
may we be concertinaing?
may you be concertinaing?
may they be concertinaing? 	may I have concertinaed?
may you have concertinaed?
may he have concertinaed?
may we have concertinaed?
may you have concertinaed?
may they have concertinaed? 	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 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I concertina?
mayn't you concertina?
mayn't he concertina?
mayn't we concertina?
mayn't you concertina?
mayn't they concertina? 	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? 	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? 	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?