I could concertina you could concertina she could concertina we could concertina you could concertina they could concertina
Forme en V-ing
I could be concertinaing you could be concertinaing she could be concertinaing we could be concertinaing you could be concertinaing they could be concertinaing
Perfect
I could have concertinaed you could have concertinaed she could have concertinaed we could have concertinaed you could have concertinaed they could have concertinaed
Perfect en V-ing
I could have been concertinaing you could have been concertinaing she could have been concertinaing we could have been concertinaing you could have been concertinaing they could have been concertinaing
Négation
Forme simple
I could not concertina you could not concertina she could not concertina we could not concertina you could not concertina they could not concertina
Forme en V-ing
I could not be concertinaing you could not be concertinaing she could not be concertinaing we could not be concertinaing you could not be concertinaing they could not be concertinaing
Perfect
I could not have concertinaed you could not have concertinaed she could not have concertinaed we could not have concertinaed you could not have concertinaed they could not have concertinaed
Perfect en V-ing
I could not have been concertinaing you could not have been concertinaing she could not have been concertinaing we could not have been concertinaing you could not have been concertinaing they could not have been concertinaing
Forme interrogative
Forme simple
could I concertina? could you concertina? could she concertina? could we concertina? could you concertina? could they concertina?
Forme en V-ing
could I be concertinaing? could you be concertinaing? could she be concertinaing? could we be concertinaing? could you be concertinaing? could they be concertinaing?
Perfect
could I have concertinaed? could you have concertinaed? could she have concertinaed? could we have concertinaed? could you have concertinaed? could they have concertinaed?
Perfect en V-ing
could I have been concertinaing? could you have been concertinaing? could she have been concertinaing? could we have been concertinaing? could you have been concertinaing? could they have been concertinaing?
Forme interro-négative
Forme simple
could I not concertina? could you not concertina? could she not concertina? could we not concertina? could you not concertina? could they not concertina?
Forme en V-ing
could I not be concertinaing? could you not be concertinaing? could she not be concertinaing? could we not be concertinaing? could you not be concertinaing? could they not be concertinaing?
Perfect
could I not have concertinaed? could you not have concertinaed? could she not have concertinaed? could we not have concertinaed? could you not have concertinaed? could they not have concertinaed?
Perfect en V-ing
could I not have been concertinaing? could you not have been concertinaing? could she not have been concertinaing? could we not have been concertinaing? could you not have been concertinaing? could they not have been concertinaing?