I could retain you could retain he could retain we could retain you could retain they could retain
Forme en V-ing
I could be retaining you could be retaining he could be retaining we could be retaining you could be retaining they could be retaining
Perfect
I could have retained you could have retained he could have retained we could have retained you could have retained they could have retained
Perfect en V-ing
I could have been retaining you could have been retaining he could have been retaining we could have been retaining you could have been retaining they could have been retaining
Négation
Forme simple
I could not retain you could not retain he could not retain we could not retain you could not retain they could not retain
Forme en V-ing
I could not be retaining you could not be retaining he could not be retaining we could not be retaining you could not be retaining they could not be retaining
Perfect
I could not have retained you could not have retained he could not have retained we could not have retained you could not have retained they could not have retained
Perfect en V-ing
I could not have been retaining you could not have been retaining he could not have been retaining we could not have been retaining you could not have been retaining they could not have been retaining
Forme interrogative
Forme simple
could I retain? could you retain? could he retain? could we retain? could you retain? could they retain?
Forme en V-ing
could I be retaining? could you be retaining? could he be retaining? could we be retaining? could you be retaining? could they be retaining?
Perfect
could I have retained? could you have retained? could he have retained? could we have retained? could you have retained? could they have retained?
Perfect en V-ing
could I have been retaining? could you have been retaining? could he have been retaining? could we have been retaining? could you have been retaining? could they have been retaining?
Forme interro-négative
Forme simple
could I not retain? could you not retain? could he not retain? could we not retain? could you not retain? could they not retain?
Forme en V-ing
could I not be retaining? could you not be retaining? could he not be retaining? could we not be retaining? could you not be retaining? could they not be retaining?
Perfect
could I not have retained? could you not have retained? could he not have retained? could we not have retained? could you not have retained? could they not have retained?
Perfect en V-ing
could I not have been retaining? could you not have been retaining? could he not have been retaining? could we not have been retaining? could you not have been retaining? could they not have been retaining?