I could modify you could modify he could modify we could modify you could modify they could modify
Forme en V-ing
I could be modifying you could be modifying he could be modifying we could be modifying you could be modifying they could be modifying
Perfect
I could have modified you could have modified he could have modified we could have modified you could have modified they could have modified
Perfect en V-ing
I could have been modifying you could have been modifying he could have been modifying we could have been modifying you could have been modifying they could have been modifying
Négation
Forme simple
I could not modify you could not modify he could not modify we could not modify you could not modify they could not modify
Forme en V-ing
I could not be modifying you could not be modifying he could not be modifying we could not be modifying you could not be modifying they could not be modifying
Perfect
I could not have modified you could not have modified he could not have modified we could not have modified you could not have modified they could not have modified
Perfect en V-ing
I could not have been modifying you could not have been modifying he could not have been modifying we could not have been modifying you could not have been modifying they could not have been modifying
Forme interrogative
Forme simple
could I modify? could you modify? could he modify? could we modify? could you modify? could they modify?
Forme en V-ing
could I be modifying? could you be modifying? could he be modifying? could we be modifying? could you be modifying? could they be modifying?
Perfect
could I have modified? could you have modified? could he have modified? could we have modified? could you have modified? could they have modified?
Perfect en V-ing
could I have been modifying? could you have been modifying? could he have been modifying? could we have been modifying? could you have been modifying? could they have been modifying?
Forme interro-négative
Forme simple
could I not modify? could you not modify? could he not modify? could we not modify? could you not modify? could they not modify?
Forme en V-ing
could I not be modifying? could you not be modifying? could he not be modifying? could we not be modifying? could you not be modifying? could they not be modifying?
Perfect
could I not have modified? could you not have modified? could he not have modified? could we not have modified? could you not have modified? could they not have modified?
Perfect en V-ing
could I not have been modifying? could you not have been modifying? could he not have been modifying? could we not have been modifying? could you not have been modifying? could they not have been modifying?