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