should concertina
Verbo regular: concertina - concertinaed- concertinaed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should concertina
you should concertina
he should concertina
we should concertina
you should concertina
they should concertina 	I should be concertinaing
you should be concertinaing
he should be concertinaing
we should be concertinaing
you should be concertinaing
they should be concertinaing	I should have concertinaed
you should have concertinaed
he should have concertinaed
we should have concertinaed
you should have concertinaed
they should have concertinaed	I should have been concertinaing
you should have been concertinaing
he should have been concertinaing
we should have been concertinaing
you should have been concertinaing
they should have been concertinaing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should not concertina
you should not concertina
he should not concertina
we should not concertina
you should not concertina
they should not concertina 	I should not be concertinaing
you should not be concertinaing
he should not be concertinaing
we should not be concertinaing
you should not be concertinaing
they should not be concertinaing	I should not have concertinaed
you should not have concertinaed
he should not have concertinaed
we should not have concertinaed
you should not have concertinaed
they should not have concertinaed	I should not have been concertinaing
you should not have been concertinaing
he should not have been concertinaing
we should not have been concertinaing
you should not have been concertinaing
they should not have been concertinaing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I not concertina?
should you not concertina?
should he not concertina?
should we not concertina?
should you not concertina?
should they not concertina? 	should I not be concertinaing?
should you not be concertinaing?
should he not be concertinaing?
should we not be concertinaing?
should you not be concertinaing?
should they not be concertinaing? 	should I not have concertinaed?
should you not have concertinaed?
should he not have concertinaed?
should we not have concertinaed?
should you not have concertinaed?
should they not have concertinaed? 	should I not have been concertinaing?
should you not have been concertinaing?
should he not have been concertinaing?
should we not have been concertinaing?
should you not have been concertinaing?
should they not have been concertinaing?