I can barn you can barn she can barn we can barn you can barn they can barn
V-ing form
I can be barning you can be barning she can be barning we can be barning you can be barning they can be barning
Perfect
I can have barned you can have barned she can have barned we can have barned you can have barned they can have barned
V-ing perfect
I can have been barning you can have been barning she can have been barning we can have been barning you can have been barning they can have been barning
Negation
Simple form
I can't barn you can't barn she can't barn we can't barn you can't barn they can't barn
V-ing form
I can't be barning you can't be barning she can't be barning we can't be barning you can't be barning they can't be barning
Perfect
I can't have barned you can't have barned she can't have barned we can't have barned you can't have barned they can't have barned
V-ing perfect
I can't have been barning you can't have been barning she can't have been barning we can't have been barning you can't have been barning they can't have been barning
Interrogative form
Simple form
can I barn? can you barn? can she barn? can we barn? can you barn? can they barn?
V-ing form
can I be barning? can you be barning? can she be barning? can we be barning? can you be barning? can they be barning?
Perfect
can I have barned? can you have barned? can she have barned? can we have barned? can you have barned? can they have barned?
V-ing perfect
can I have been barning? can you have been barning? can she have been barning? can we have been barning? can you have been barning? can they have been barning?
Interro-negative form
Simple form
can't I barn? can't you barn? can't she barn? can't we barn? can't you barn? can't they barn?
V-ing form
can't I be barning? can't you be barning? can't she be barning? can't we be barning? can't you be barning? can't they be barning?
Perfect
can't I have barned? can't you have barned? can't she have barned? can't we have barned? can't you have barned? can't they have barned?
V-ing perfect
can't I have been barning? can't you have been barning? can't she have been barning? can't we have been barning? can't you have been barning? can't they have been barning?