I could trail you could trail he could trail we could trail you could trail they could trail
Forme en V-ing
I could be trailing you could be trailing he could be trailing we could be trailing you could be trailing they could be trailing
Perfect
I could have trailed you could have trailed he could have trailed we could have trailed you could have trailed they could have trailed
Perfect en V-ing
I could have been trailing you could have been trailing he could have been trailing we could have been trailing you could have been trailing they could have been trailing
Négation
Forme simple
I could not trail you could not trail he could not trail we could not trail you could not trail they could not trail
Forme en V-ing
I could not be trailing you could not be trailing he could not be trailing we could not be trailing you could not be trailing they could not be trailing
Perfect
I could not have trailed you could not have trailed he could not have trailed we could not have trailed you could not have trailed they could not have trailed
Perfect en V-ing
I could not have been trailing you could not have been trailing he could not have been trailing we could not have been trailing you could not have been trailing they could not have been trailing
Forme interrogative
Forme simple
could I trail? could you trail? could he trail? could we trail? could you trail? could they trail?
Forme en V-ing
could I be trailing? could you be trailing? could he be trailing? could we be trailing? could you be trailing? could they be trailing?
Perfect
could I have trailed? could you have trailed? could he have trailed? could we have trailed? could you have trailed? could they have trailed?
Perfect en V-ing
could I have been trailing? could you have been trailing? could he have been trailing? could we have been trailing? could you have been trailing? could they have been trailing?
Forme interro-négative
Forme simple
could I not trail? could you not trail? could he not trail? could we not trail? could you not trail? could they not trail?
Forme en V-ing
could I not be trailing? could you not be trailing? could he not be trailing? could we not be trailing? could you not be trailing? could they not be trailing?
Perfect
could I not have trailed? could you not have trailed? could he not have trailed? could we not have trailed? could you not have trailed? could they not have trailed?
Perfect en V-ing
could I not have been trailing? could you not have been trailing? could he not have been trailing? could we not have been trailing? could you not have been trailing? could they not have been trailing?