English verb conjugation
MUST HARKEN

Regular verb: harken - harkened - harkened

Affirmation

Simple form	V-ing form
I must harken you must harken he must harken we must harken you must harken they must harken	I must be harkening you must be harkening he must be harkening we must be harkening you must be harkening they must be harkening
Perfect	V-ing perfect
I must have harkened you must have harkened he must have harkened we must have harkened you must have harkened they must have harkened	I must have been harkening you must have been harkening he must have been harkening we must have been harkening you must have been harkening they must have been harkening

Negation

Simple form	V-ing form
I mustn't harken you mustn't harken he mustn't harken we mustn't harken you mustn't harken they mustn't harken	I mustn't be harkening you mustn't be harkening he mustn't be harkening we mustn't be harkening you mustn't be harkening they mustn't be harkening
Perfect	V-ing perfect
I mustn't have harkened you mustn't have harkened he mustn't have harkened we mustn't have harkened you mustn't have harkened they mustn't have harkened	I mustn't have been harkening you mustn't have been harkening he mustn't have been harkening we mustn't have been harkening you mustn't have been harkening they mustn't have been harkening

Interrogative form

Simple form	V-ing form
must I harken? must you harken? must he harken? must we harken? must you harken? must they harken?	must I be harkening? must you be harkening? must he be harkening? must we be harkening? must you be harkening? must they be harkening?
Perfect	V-ing perfect
must I have harkened? must you have harkened? must he have harkened? must we have harkened? must you have harkened? must they have harkened?	must I have been harkening? must you have been harkening? must he have been harkening? must we have been harkening? must you have been harkening? must they have been harkening?

Interro-negative form

Simple form	V-ing form
mustn't I harken? mustn't you harken? mustn't he harken? mustn't we harken? mustn't you harken? mustn't they harken?	mustn't I be harkening? mustn't you be harkening? mustn't he be harkening? mustn't we be harkening? mustn't you be harkening? mustn't they be harkening?
Perfect	V-ing perfect
mustn't I have harkened? mustn't you have harkened? mustn't he have harkened? mustn't we have harkened? mustn't you have harkened? mustn't they have harkened?	mustn't I have been harkening? mustn't you have been harkening? mustn't he have been harkening? mustn't we have been harkening? mustn't you have been harkening? mustn't they have been harkening?