I could diphthongise you could diphthongise he could diphthongise we could diphthongise you could diphthongise they could diphthongise
Forme en V-ing
I could be diphthongising you could be diphthongising he could be diphthongising we could be diphthongising you could be diphthongising they could be diphthongising
Perfect
I could have diphthongised you could have diphthongised he could have diphthongised we could have diphthongised you could have diphthongised they could have diphthongised
Perfect en V-ing
I could have been diphthongising you could have been diphthongising he could have been diphthongising we could have been diphthongising you could have been diphthongising they could have been diphthongising
Négation
Forme simple
I could not diphthongise you could not diphthongise he could not diphthongise we could not diphthongise you could not diphthongise they could not diphthongise
Forme en V-ing
I could not be diphthongising you could not be diphthongising he could not be diphthongising we could not be diphthongising you could not be diphthongising they could not be diphthongising
Perfect
I could not have diphthongised you could not have diphthongised he could not have diphthongised we could not have diphthongised you could not have diphthongised they could not have diphthongised
Perfect en V-ing
I could not have been diphthongising you could not have been diphthongising he could not have been diphthongising we could not have been diphthongising you could not have been diphthongising they could not have been diphthongising
Forme interrogative
Forme simple
could I diphthongise? could you diphthongise? could he diphthongise? could we diphthongise? could you diphthongise? could they diphthongise?
Forme en V-ing
could I be diphthongising? could you be diphthongising? could he be diphthongising? could we be diphthongising? could you be diphthongising? could they be diphthongising?
Perfect
could I have diphthongised? could you have diphthongised? could he have diphthongised? could we have diphthongised? could you have diphthongised? could they have diphthongised?
Perfect en V-ing
could I have been diphthongising? could you have been diphthongising? could he have been diphthongising? could we have been diphthongising? could you have been diphthongising? could they have been diphthongising?
Forme interro-négative
Forme simple
could I not diphthongise? could you not diphthongise? could he not diphthongise? could we not diphthongise? could you not diphthongise? could they not diphthongise?
Forme en V-ing
could I not be diphthongising? could you not be diphthongising? could he not be diphthongising? could we not be diphthongising? could you not be diphthongising? could they not be diphthongising?
Perfect
could I not have diphthongised? could you not have diphthongised? could he not have diphthongised? could we not have diphthongised? could you not have diphthongised? could they not have diphthongised?
Perfect en V-ing
could I not have been diphthongising? could you not have been diphthongising? could he not have been diphthongising? could we not have been diphthongising? could you not have been diphthongising? could they not have been diphthongising?