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