I could improvise you could improvise he could improvise we could improvise you could improvise they could improvise
Forme en V-ing
I could be improvising you could be improvising he could be improvising we could be improvising you could be improvising they could be improvising
Perfect
I could have improvised you could have improvised he could have improvised we could have improvised you could have improvised they could have improvised
Perfect en V-ing
I could have been improvising you could have been improvising he could have been improvising we could have been improvising you could have been improvising they could have been improvising
Négation
Forme simple
I could not improvise you could not improvise he could not improvise we could not improvise you could not improvise they could not improvise
Forme en V-ing
I could not be improvising you could not be improvising he could not be improvising we could not be improvising you could not be improvising they could not be improvising
Perfect
I could not have improvised you could not have improvised he could not have improvised we could not have improvised you could not have improvised they could not have improvised
Perfect en V-ing
I could not have been improvising you could not have been improvising he could not have been improvising we could not have been improvising you could not have been improvising they could not have been improvising
Forme interrogative
Forme simple
could I improvise? could you improvise? could he improvise? could we improvise? could you improvise? could they improvise?
Forme en V-ing
could I be improvising? could you be improvising? could he be improvising? could we be improvising? could you be improvising? could they be improvising?
Perfect
could I have improvised? could you have improvised? could he have improvised? could we have improvised? could you have improvised? could they have improvised?
Perfect en V-ing
could I have been improvising? could you have been improvising? could he have been improvising? could we have been improvising? could you have been improvising? could they have been improvising?
Forme interro-négative
Forme simple
could I not improvise? could you not improvise? could he not improvise? could we not improvise? could you not improvise? could they not improvise?
Forme en V-ing
could I not be improvising? could you not be improvising? could he not be improvising? could we not be improvising? could you not be improvising? could they not be improvising?
Perfect
could I not have improvised? could you not have improvised? could he not have improvised? could we not have improvised? could you not have improvised? could they not have improvised?
Perfect en V-ing
could I not have been improvising? could you not have been improvising? could he not have been improvising? could we not have been improvising? could you not have been improvising? could they not have been improvising?