English verb conjugation
MUST HARK

Regular verb: hark - harked - harked

Affirmation

Simple form	V-ing form
I must hark you must hark he must hark we must hark you must hark they must hark	I must be harking you must be harking he must be harking we must be harking you must be harking they must be harking
Perfect	V-ing perfect
I must have harked you must have harked he must have harked we must have harked you must have harked they must have harked	I must have been harking you must have been harking he must have been harking we must have been harking you must have been harking they must have been harking

Negation

Simple form	V-ing form
I mustn't hark you mustn't hark he mustn't hark we mustn't hark you mustn't hark they mustn't hark	I mustn't be harking you mustn't be harking he mustn't be harking we mustn't be harking you mustn't be harking they mustn't be harking
Perfect	V-ing perfect
I mustn't have harked you mustn't have harked he mustn't have harked we mustn't have harked you mustn't have harked they mustn't have harked	I mustn't have been harking you mustn't have been harking he mustn't have been harking we mustn't have been harking you mustn't have been harking they mustn't have been harking

Interrogative form

Simple form	V-ing form
must I hark? must you hark? must he hark? must we hark? must you hark? must they hark?	must I be harking? must you be harking? must he be harking? must we be harking? must you be harking? must they be harking?
Perfect	V-ing perfect
must I have harked? must you have harked? must he have harked? must we have harked? must you have harked? must they have harked?	must I have been harking? must you have been harking? must he have been harking? must we have been harking? must you have been harking? must they have been harking?

Interro-negative form

Simple form	V-ing form
mustn't I hark? mustn't you hark? mustn't he hark? mustn't we hark? mustn't you hark? mustn't they hark?	mustn't I be harking? mustn't you be harking? mustn't he be harking? mustn't we be harking? mustn't you be harking? mustn't they be harking?
Perfect	V-ing perfect
mustn't I have harked? mustn't you have harked? mustn't he have harked? mustn't we have harked? mustn't you have harked? mustn't they have harked?	mustn't I have been harking? mustn't you have been harking? mustn't he have been harking? mustn't we have been harking? mustn't you have been harking? mustn't they have been harking?