English verb conjugation
MUST HARKEN

Regular verb: harken - harkened - harkened

Affirmation

Simple form	V-ing form
I must harken you must harken she must harken we must harken you must harken they must harken	I must be harkening you must be harkening she 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 she 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 she 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 she 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 she 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 she 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 she 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 she harken? must we harken? must you harken? must they harken?	must I be harkening? must you be harkening? must she 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 she 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 she 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 she 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 she 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 she 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 she have been harkening? mustn't we have been harkening? mustn't you have been harkening? mustn't they have been harkening?