I could guard you could guard he could guard we could guard you could guard they could guard
Forme en V-ing
I could be guarding you could be guarding he could be guarding we could be guarding you could be guarding they could be guarding
Perfect
I could have guarded you could have guarded he could have guarded we could have guarded you could have guarded they could have guarded
Perfect en V-ing
I could have been guarding you could have been guarding he could have been guarding we could have been guarding you could have been guarding they could have been guarding
Négation
Forme simple
I could not guard you could not guard he could not guard we could not guard you could not guard they could not guard
Forme en V-ing
I could not be guarding you could not be guarding he could not be guarding we could not be guarding you could not be guarding they could not be guarding
Perfect
I could not have guarded you could not have guarded he could not have guarded we could not have guarded you could not have guarded they could not have guarded
Perfect en V-ing
I could not have been guarding you could not have been guarding he could not have been guarding we could not have been guarding you could not have been guarding they could not have been guarding
Forme interrogative
Forme simple
could I guard? could you guard? could he guard? could we guard? could you guard? could they guard?
Forme en V-ing
could I be guarding? could you be guarding? could he be guarding? could we be guarding? could you be guarding? could they be guarding?
Perfect
could I have guarded? could you have guarded? could he have guarded? could we have guarded? could you have guarded? could they have guarded?
Perfect en V-ing
could I have been guarding? could you have been guarding? could he have been guarding? could we have been guarding? could you have been guarding? could they have been guarding?
Forme interro-négative
Forme simple
could I not guard? could you not guard? could he not guard? could we not guard? could you not guard? could they not guard?
Forme en V-ing
could I not be guarding? could you not be guarding? could he not be guarding? could we not be guarding? could you not be guarding? could they not be guarding?
Perfect
could I not have guarded? could you not have guarded? could he not have guarded? could we not have guarded? could you not have guarded? could they not have guarded?
Perfect en V-ing
could I not have been guarding? could you not have been guarding? could he not have been guarding? could we not have been guarding? could you not have been guarding? could they not have been guarding?