I could voyage you could voyage he could voyage we could voyage you could voyage they could voyage
V-ing form
I could be voyaging you could be voyaging he could be voyaging we could be voyaging you could be voyaging they could be voyaging
Perfect
I could have voyaged you could have voyaged he could have voyaged we could have voyaged you could have voyaged they could have voyaged
V-ing perfect
I could have been voyaging you could have been voyaging he could have been voyaging we could have been voyaging you could have been voyaging they could have been voyaging
Negation
Simple form
I could not voyage you could not voyage he could not voyage we could not voyage you could not voyage they could not voyage
V-ing form
I could not be voyaging you could not be voyaging he could not be voyaging we could not be voyaging you could not be voyaging they could not be voyaging
Perfect
I could not have voyaged you could not have voyaged he could not have voyaged we could not have voyaged you could not have voyaged they could not have voyaged
V-ing perfect
I could not have been voyaging you could not have been voyaging he could not have been voyaging we could not have been voyaging you could not have been voyaging they could not have been voyaging
Interrogative form
Simple form
could I voyage? could you voyage? could he voyage? could we voyage? could you voyage? could they voyage?
V-ing form
could I be voyaging? could you be voyaging? could he be voyaging? could we be voyaging? could you be voyaging? could they be voyaging?
Perfect
could I have voyaged? could you have voyaged? could he have voyaged? could we have voyaged? could you have voyaged? could they have voyaged?
V-ing perfect
could I have been voyaging? could you have been voyaging? could he have been voyaging? could we have been voyaging? could you have been voyaging? could they have been voyaging?
Interro-negative form
Simple form
could I not voyage? could you not voyage? could he not voyage? could we not voyage? could you not voyage? could they not voyage?
V-ing form
could I not be voyaging? could you not be voyaging? could he not be voyaging? could we not be voyaging? could you not be voyaging? could they not be voyaging?
Perfect
could I not have voyaged? could you not have voyaged? could he not have voyaged? could we not have voyaged? could you not have voyaged? could they not have voyaged?
V-ing perfect
could I not have been voyaging? could you not have been voyaging? could he not have been voyaging? could we not have been voyaging? could you not have been voyaging? could they not have been voyaging?