should concertina
Regular verb: concertina - concertinaed- concertinaed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd concertina
you'd concertina
he'd concertina
we'd concertina
you'd concertina
they'd concertina 	I'd be concertinaing
you'd be concertinaing
he'd be concertinaing
we'd be concertinaing
you'd be concertinaing
they'd be concertinaing	I should've concertinaed
you should've concertinaed
he should've concertinaed
we should've concertinaed
you should've concertinaed
they should've concertinaed	I should've been concertinaing
you should've been concertinaing
he should've been concertinaing
we should've been concertinaing
you should've been concertinaing
they should've been concertinaing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't concertina
you shouldn't concertina
he shouldn't concertina
we shouldn't concertina
you shouldn't concertina
they shouldn't concertina 	I shouldn't be concertinaing
you shouldn't be concertinaing
he shouldn't be concertinaing
we shouldn't be concertinaing
you shouldn't be concertinaing
they shouldn't be concertinaing	I shouldn't have concertinaed
you shouldn't have concertinaed
he shouldn't have concertinaed
we shouldn't have concertinaed
you shouldn't have concertinaed
they shouldn't have concertinaed	I shouldn't have been concertinaing
you shouldn't have been concertinaing
he shouldn't have been concertinaing
we shouldn't have been concertinaing
you shouldn't have been concertinaing
they shouldn't have been concertinaing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I concertina?
should you concertina?
should he concertina?
should we concertina?
should you concertina?
should they concertina? 	should I be concertinaing?
should you be concertinaing?
should he be concertinaing?
should we be concertinaing?
should you be concertinaing?
should they be concertinaing? 	should I have concertinaed?
should you have concertinaed?
should he have concertinaed?
should we have concertinaed?
should you have concertinaed?
should they have concertinaed? 	should I have been concertinaing?
should you have been concertinaing?
should he have been concertinaing?
should we have been concertinaing?
should you have been concertinaing?
should they have been concertinaing? 	

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