I could turn you could turn she could turn we could turn you could turn they could turn
Forme en V-ing
I could be turning you could be turning she could be turning we could be turning you could be turning they could be turning
Perfect
I could have turned you could have turned she could have turned we could have turned you could have turned they could have turned
Perfect en V-ing
I could have been turning you could have been turning she could have been turning we could have been turning you could have been turning they could have been turning
Négation
Forme simple
I could not turn you could not turn she could not turn we could not turn you could not turn they could not turn
Forme en V-ing
I could not be turning you could not be turning she could not be turning we could not be turning you could not be turning they could not be turning
Perfect
I could not have turned you could not have turned she could not have turned we could not have turned you could not have turned they could not have turned
Perfect en V-ing
I could not have been turning you could not have been turning she could not have been turning we could not have been turning you could not have been turning they could not have been turning
Forme interrogative
Forme simple
could I turn? could you turn? could she turn? could we turn? could you turn? could they turn?
Forme en V-ing
could I be turning? could you be turning? could she be turning? could we be turning? could you be turning? could they be turning?
Perfect
could I have turned? could you have turned? could she have turned? could we have turned? could you have turned? could they have turned?
Perfect en V-ing
could I have been turning? could you have been turning? could she have been turning? could we have been turning? could you have been turning? could they have been turning?
Forme interro-négative
Forme simple
could I not turn? could you not turn? could she not turn? could we not turn? could you not turn? could they not turn?
Forme en V-ing
could I not be turning? could you not be turning? could she not be turning? could we not be turning? could you not be turning? could they not be turning?
Perfect
could I not have turned? could you not have turned? could she not have turned? could we not have turned? could you not have turned? could they not have turned?
Perfect en V-ing
could I not have been turning? could you not have been turning? could she not have been turning? could we not have been turning? could you not have been turning? could they not have been turning?