I could concertise you could concertise she could concertise we could concertise you could concertise they could concertise
Forme en V-ing
I could be concertising you could be concertising she could be concertising we could be concertising you could be concertising they could be concertising
Perfect
I could have concertised you could have concertised she could have concertised we could have concertised you could have concertised they could have concertised
Perfect en V-ing
I could have been concertising you could have been concertising she could have been concertising we could have been concertising you could have been concertising they could have been concertising
Négation
Forme simple
I could not concertise you could not concertise she could not concertise we could not concertise you could not concertise they could not concertise
Forme en V-ing
I could not be concertising you could not be concertising she could not be concertising we could not be concertising you could not be concertising they could not be concertising
Perfect
I could not have concertised you could not have concertised she could not have concertised we could not have concertised you could not have concertised they could not have concertised
Perfect en V-ing
I could not have been concertising you could not have been concertising she could not have been concertising we could not have been concertising you could not have been concertising they could not have been concertising
Forme interrogative
Forme simple
could I concertise? could you concertise? could she concertise? could we concertise? could you concertise? could they concertise?
Forme en V-ing
could I be concertising? could you be concertising? could she be concertising? could we be concertising? could you be concertising? could they be concertising?
Perfect
could I have concertised? could you have concertised? could she have concertised? could we have concertised? could you have concertised? could they have concertised?
Perfect en V-ing
could I have been concertising? could you have been concertising? could she have been concertising? could we have been concertising? could you have been concertising? could they have been concertising?
Forme interro-négative
Forme simple
could I not concertise? could you not concertise? could she not concertise? could we not concertise? could you not concertise? could they not concertise?
Forme en V-ing
could I not be concertising? could you not be concertising? could she not be concertising? could we not be concertising? could you not be concertising? could they not be concertising?
Perfect
could I not have concertised? could you not have concertised? could she not have concertised? could we not have concertised? could you not have concertised? could they not have concertised?
Perfect en V-ing
could I not have been concertising? could you not have been concertising? could she not have been concertising? could we not have been concertising? could you not have been concertising? could they not have been concertising?