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