I could south you could south he could south we could south you could south they could south
Forme en V-ing
I could be southing you could be southing he could be southing we could be southing you could be southing they could be southing
Perfect
I could have southed you could have southed he could have southed we could have southed you could have southed they could have southed
Perfect en V-ing
I could have been southing you could have been southing he could have been southing we could have been southing you could have been southing they could have been southing
Négation
Forme simple
I could not south you could not south he could not south we could not south you could not south they could not south
Forme en V-ing
I could not be southing you could not be southing he could not be southing we could not be southing you could not be southing they could not be southing
Perfect
I could not have southed you could not have southed he could not have southed we could not have southed you could not have southed they could not have southed
Perfect en V-ing
I could not have been southing you could not have been southing he could not have been southing we could not have been southing you could not have been southing they could not have been southing
Forme interrogative
Forme simple
could I south? could you south? could he south? could we south? could you south? could they south?
Forme en V-ing
could I be southing? could you be southing? could he be southing? could we be southing? could you be southing? could they be southing?
Perfect
could I have southed? could you have southed? could he have southed? could we have southed? could you have southed? could they have southed?
Perfect en V-ing
could I have been southing? could you have been southing? could he have been southing? could we have been southing? could you have been southing? could they have been southing?
Forme interro-négative
Forme simple
could I not south? could you not south? could he not south? could we not south? could you not south? could they not south?
Forme en V-ing
could I not be southing? could you not be southing? could he not be southing? could we not be southing? could you not be southing? could they not be southing?
Perfect
could I not have southed? could you not have southed? could he not have southed? could we not have southed? could you not have southed? could they not have southed?
Perfect en V-ing
could I not have been southing? could you not have been southing? could he not have been southing? could we not have been southing? could you not have been southing? could they not have been southing?