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