I could portage you could portage he could portage we could portage you could portage they could portage
V-ing form
I could be portaging you could be portaging he could be portaging we could be portaging you could be portaging they could be portaging
Perfect
I could have portaged you could have portaged he could have portaged we could have portaged you could have portaged they could have portaged
V-ing perfect
I could have been portaging you could have been portaging he could have been portaging we could have been portaging you could have been portaging they could have been portaging
Negation
Simple form
I could not portage you could not portage he could not portage we could not portage you could not portage they could not portage
V-ing form
I could not be portaging you could not be portaging he could not be portaging we could not be portaging you could not be portaging they could not be portaging
Perfect
I could not have portaged you could not have portaged he could not have portaged we could not have portaged you could not have portaged they could not have portaged
V-ing perfect
I could not have been portaging you could not have been portaging he could not have been portaging we could not have been portaging you could not have been portaging they could not have been portaging
Interrogative form
Simple form
could I portage? could you portage? could he portage? could we portage? could you portage? could they portage?
V-ing form
could I be portaging? could you be portaging? could he be portaging? could we be portaging? could you be portaging? could they be portaging?
Perfect
could I have portaged? could you have portaged? could he have portaged? could we have portaged? could you have portaged? could they have portaged?
V-ing perfect
could I have been portaging? could you have been portaging? could he have been portaging? could we have been portaging? could you have been portaging? could they have been portaging?
Interro-negative form
Simple form
could I not portage? could you not portage? could he not portage? could we not portage? could you not portage? could they not portage?
V-ing form
could I not be portaging? could you not be portaging? could he not be portaging? could we not be portaging? could you not be portaging? could they not be portaging?
Perfect
could I not have portaged? could you not have portaged? could he not have portaged? could we not have portaged? could you not have portaged? could they not have portaged?
V-ing perfect
could I not have been portaging? could you not have been portaging? could he not have been portaging? could we not have been portaging? could you not have been portaging? could they not have been portaging?