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 must not hark you must not hark he must not hark we must not hark you must not hark they must not hark	I must not be harking you must not be harking he must not be harking we must not be harking you must not be harking they must not be harking
Perfect	V-ing perfect
I must not have harked you must not have harked he must not have harked we must not have harked you must not have harked they must not have harked	I must not have been harking you must not have been harking he must not have been harking we must not have been harking you must not have been harking they must not 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
must I not hark? must you not hark? must he not hark? must we not hark? must you not hark? must they not hark?	must I not be harking? must you not be harking? must he not be harking? must we not be harking? must you not be harking? must they not be harking?
Perfect	V-ing perfect
must I not have harked? must you not have harked? must he not have harked? must we not have harked? must you not have harked? must they not have harked?	must I not have been harking? must you not have been harking? must he not have been harking? must we not have been harking? must you not have been harking? must they not have been harking?