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 couldn't portage you couldn't portage he couldn't portage we couldn't portage you couldn't portage they couldn't portage
V-ing form
I couldn't be portaging you couldn't be portaging he couldn't be portaging we couldn't be portaging you couldn't be portaging they couldn't be portaging
Perfect
I couldn't have portaged you couldn't have portaged he couldn't have portaged we couldn't have portaged you couldn't have portaged they couldn't have portaged
V-ing perfect
I couldn't have been portaging you couldn't have been portaging he couldn't have been portaging we couldn't have been portaging you couldn't have been portaging they couldn't 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
couldn't I portage? couldn't you portage? couldn't he portage? couldn't we portage? couldn't you portage? couldn't they portage?
V-ing form
couldn't I be portaging? couldn't you be portaging? couldn't he be portaging? couldn't we be portaging? couldn't you be portaging? couldn't they be portaging?
Perfect
couldn't I have portaged? couldn't you have portaged? couldn't he have portaged? couldn't we have portaged? couldn't you have portaged? couldn't they have portaged?
V-ing perfect
couldn't I have been portaging? couldn't you have been portaging? couldn't he have been portaging? couldn't we have been portaging? couldn't you have been portaging? couldn't they have been portaging?