I must hearken you must hearken he must hearken we must hearken you must hearken they must hearken
V-ing form
I must be hearkening you must be hearkening he must be hearkening we must be hearkening you must be hearkening they must be hearkening
Perfect
I must have hearkened you must have hearkened he must have hearkened we must have hearkened you must have hearkened they must have hearkened
V-ing perfect
I must have been hearkening you must have been hearkening he must have been hearkening we must have been hearkening you must have been hearkening they must have been hearkening
Negation
Simple form
I mustn't hearken you mustn't hearken he mustn't hearken we mustn't hearken you mustn't hearken they mustn't hearken
V-ing form
I mustn't be hearkening you mustn't be hearkening he mustn't be hearkening we mustn't be hearkening you mustn't be hearkening they mustn't be hearkening
Perfect
I mustn't have hearkened you mustn't have hearkened he mustn't have hearkened we mustn't have hearkened you mustn't have hearkened they mustn't have hearkened
V-ing perfect
I mustn't have been hearkening you mustn't have been hearkening he mustn't have been hearkening we mustn't have been hearkening you mustn't have been hearkening they mustn't have been hearkening
Interrogative form
Simple form
must I hearken? must you hearken? must he hearken? must we hearken? must you hearken? must they hearken?
V-ing form
must I be hearkening? must you be hearkening? must he be hearkening? must we be hearkening? must you be hearkening? must they be hearkening?
Perfect
must I have hearkened? must you have hearkened? must he have hearkened? must we have hearkened? must you have hearkened? must they have hearkened?
V-ing perfect
must I have been hearkening? must you have been hearkening? must he have been hearkening? must we have been hearkening? must you have been hearkening? must they have been hearkening?
Interro-negative form
Simple form
mustn't I hearken? mustn't you hearken? mustn't he hearken? mustn't we hearken? mustn't you hearken? mustn't they hearken?
V-ing form
mustn't I be hearkening? mustn't you be hearkening? mustn't he be hearkening? mustn't we be hearkening? mustn't you be hearkening? mustn't they be hearkening?
Perfect
mustn't I have hearkened? mustn't you have hearkened? mustn't he have hearkened? mustn't we have hearkened? mustn't you have hearkened? mustn't they have hearkened?
V-ing perfect
mustn't I have been hearkening? mustn't you have been hearkening? mustn't he have been hearkening? mustn't we have been hearkening? mustn't you have been hearkening? mustn't they have been hearkening?