I can hearken you can hearken he can hearken we can hearken you can hearken they can hearken
V-ing form
I can be hearkening you can be hearkening he can be hearkening we can be hearkening you can be hearkening they can be hearkening
Perfect
I can have hearkened you can have hearkened he can have hearkened we can have hearkened you can have hearkened they can have hearkened
V-ing perfect
I can have been hearkening you can have been hearkening he can have been hearkening we can have been hearkening you can have been hearkening they can have been hearkening
Negation
Simple form
I cannot hearken you cannot hearken he cannot hearken we cannot hearken you cannot hearken they cannot hearken
V-ing form
I cannot be hearkening you cannot be hearkening he cannot be hearkening we cannot be hearkening you cannot be hearkening they cannot be hearkening
Perfect
I cannot have hearkened you cannot have hearkened he cannot have hearkened we cannot have hearkened you cannot have hearkened they cannot have hearkened
V-ing perfect
I cannot have been hearkening you cannot have been hearkening he cannot have been hearkening we cannot have been hearkening you cannot have been hearkening they cannot have been hearkening
Interrogative form
Simple form
can I hearken? can you hearken? can he hearken? can we hearken? can you hearken? can they hearken?
V-ing form
can I be hearkening? can you be hearkening? can he be hearkening? can we be hearkening? can you be hearkening? can they be hearkening?
Perfect
can I have hearkened? can you have hearkened? can he have hearkened? can we have hearkened? can you have hearkened? can they have hearkened?
V-ing perfect
can I have been hearkening? can you have been hearkening? can he have been hearkening? can we have been hearkening? can you have been hearkening? can they have been hearkening?
Interro-negative form
Simple form
can I not hearken? can you not hearken? can he not hearken? can we not hearken? can you not hearken? can they not hearken?
V-ing form
can I not be hearkening? can you not be hearkening? can he not be hearkening? can we not be hearkening? can you not be hearkening? can they not be hearkening?
Perfect
can I not have hearkened? can you not have hearkened? can he not have hearkened? can we not have hearkened? can you not have hearkened? can they not have hearkened?
V-ing perfect
can I not have been hearkening? can you not have been hearkening? can he not have been hearkening? can we not have been hearkening? can you not have been hearkening? can they not have been hearkening?