English verb conjugation
MUST HARSHEN

Regular verb: harshen - harshened - harshened

Affirmation

Simple form	V-ing form
I must harshen you must harshen he must harshen we must harshen you must harshen they must harshen	I must be harshening you must be harshening he must be harshening we must be harshening you must be harshening they must be harshening
Perfect	V-ing perfect
I must have harshened you must have harshened he must have harshened we must have harshened you must have harshened they must have harshened	I must have been harshening you must have been harshening he must have been harshening we must have been harshening you must have been harshening they must have been harshening

Negation

Simple form	V-ing form
I mustn't harshen you mustn't harshen he mustn't harshen we mustn't harshen you mustn't harshen they mustn't harshen	I mustn't be harshening you mustn't be harshening he mustn't be harshening we mustn't be harshening you mustn't be harshening they mustn't be harshening
Perfect	V-ing perfect
I mustn't have harshened you mustn't have harshened he mustn't have harshened we mustn't have harshened you mustn't have harshened they mustn't have harshened	I mustn't have been harshening you mustn't have been harshening he mustn't have been harshening we mustn't have been harshening you mustn't have been harshening they mustn't have been harshening

Interrogative form

Simple form	V-ing form
must I harshen? must you harshen? must he harshen? must we harshen? must you harshen? must they harshen?	must I be harshening? must you be harshening? must he be harshening? must we be harshening? must you be harshening? must they be harshening?
Perfect	V-ing perfect
must I have harshened? must you have harshened? must he have harshened? must we have harshened? must you have harshened? must they have harshened?	must I have been harshening? must you have been harshening? must he have been harshening? must we have been harshening? must you have been harshening? must they have been harshening?

Interro-negative form

Simple form	V-ing form
mustn't I harshen? mustn't you harshen? mustn't he harshen? mustn't we harshen? mustn't you harshen? mustn't they harshen?	mustn't I be harshening? mustn't you be harshening? mustn't he be harshening? mustn't we be harshening? mustn't you be harshening? mustn't they be harshening?
Perfect	V-ing perfect
mustn't I have harshened? mustn't you have harshened? mustn't he have harshened? mustn't we have harshened? mustn't you have harshened? mustn't they have harshened?	mustn't I have been harshening? mustn't you have been harshening? mustn't he have been harshening? mustn't we have been harshening? mustn't you have been harshening? mustn't they have been harshening?