I could concertise you could concertise he could concertise we could concertise you could concertise they could concertise
Forme en V-ing
I could be concertising you could be concertising he could be concertising we could be concertising you could be concertising they could be concertising
Perfect
I could have concertised you could have concertised he 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 he could have been concertising we could have been concertising you could have been concertising they could have been concertising
Négation
Forme simple
I couldn't concertise you couldn't concertise he couldn't concertise we couldn't concertise you couldn't concertise they couldn't concertise
Forme en V-ing
I couldn't be concertising you couldn't be concertising he couldn't be concertising we couldn't be concertising you couldn't be concertising they couldn't be concertising
Perfect
I couldn't have concertised you couldn't have concertised he couldn't have concertised we couldn't have concertised you couldn't have concertised they couldn't have concertised
Perfect en V-ing
I couldn't have been concertising you couldn't have been concertising he couldn't have been concertising we couldn't have been concertising you couldn't have been concertising they couldn't have been concertising
Forme interrogative
Forme simple
could I concertise? could you concertise? could he concertise? could we concertise? could you concertise? could they concertise?
Forme en V-ing
could I be concertising? could you be concertising? could he be concertising? could we be concertising? could you be concertising? could they be concertising?
Perfect
could I have concertised? could you have concertised? could he 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 he have been concertising? could we have been concertising? could you have been concertising? could they have been concertising?
Forme interro-négative
Forme simple
couldn't I concertise? couldn't you concertise? couldn't he concertise? couldn't we concertise? couldn't you concertise? couldn't they concertise?
Forme en V-ing
couldn't I be concertising? couldn't you be concertising? couldn't he be concertising? couldn't we be concertising? couldn't you be concertising? couldn't they be concertising?
Perfect
couldn't I have concertised? couldn't you have concertised? couldn't he have concertised? couldn't we have concertised? couldn't you have concertised? couldn't they have concertised?
Perfect en V-ing
couldn't I have been concertising? couldn't you have been concertising? couldn't he have been concertising? couldn't we have been concertising? couldn't you have been concertising? couldn't they have been concertising?