I could serge you could serge he could serge we could serge you could serge they could serge
Forme en V-ing
I could be serging you could be serging he could be serging we could be serging you could be serging they could be serging
Perfect
I could have serged you could have serged he could have serged we could have serged you could have serged they could have serged
Perfect en V-ing
I could have been serging you could have been serging he could have been serging we could have been serging you could have been serging they could have been serging
Négation
Forme simple
I could not serge you could not serge he could not serge we could not serge you could not serge they could not serge
Forme en V-ing
I could not be serging you could not be serging he could not be serging we could not be serging you could not be serging they could not be serging
Perfect
I could not have serged you could not have serged he could not have serged we could not have serged you could not have serged they could not have serged
Perfect en V-ing
I could not have been serging you could not have been serging he could not have been serging we could not have been serging you could not have been serging they could not have been serging
Forme interrogative
Forme simple
could I serge? could you serge? could he serge? could we serge? could you serge? could they serge?
Forme en V-ing
could I be serging? could you be serging? could he be serging? could we be serging? could you be serging? could they be serging?
Perfect
could I have serged? could you have serged? could he have serged? could we have serged? could you have serged? could they have serged?
Perfect en V-ing
could I have been serging? could you have been serging? could he have been serging? could we have been serging? could you have been serging? could they have been serging?
Forme interro-négative
Forme simple
could I not serge? could you not serge? could he not serge? could we not serge? could you not serge? could they not serge?
Forme en V-ing
could I not be serging? could you not be serging? could he not be serging? could we not be serging? could you not be serging? could they not be serging?
Perfect
could I not have serged? could you not have serged? could he not have serged? could we not have serged? could you not have serged? could they not have serged?
Perfect en V-ing
could I not have been serging? could you not have been serging? could he not have been serging? could we not have been serging? could you not have been serging? could they not have been serging?