English verb conjugation
MUST FURROW

Regular verb: furrow - furrowed - furrowed

Affirmation

Simple form	V-ing form
I must furrow you must furrow he must furrow we must furrow you must furrow they must furrow	I must be furrowing you must be furrowing he must be furrowing we must be furrowing you must be furrowing they must be furrowing
Perfect	V-ing perfect
I must have furrowed you must have furrowed he must have furrowed we must have furrowed you must have furrowed they must have furrowed	I must have been furrowing you must have been furrowing he must have been furrowing we must have been furrowing you must have been furrowing they must have been furrowing

Negation

Simple form	V-ing form
I mustn't furrow you mustn't furrow he mustn't furrow we mustn't furrow you mustn't furrow they mustn't furrow	I mustn't be furrowing you mustn't be furrowing he mustn't be furrowing we mustn't be furrowing you mustn't be furrowing they mustn't be furrowing
Perfect	V-ing perfect
I mustn't have furrowed you mustn't have furrowed he mustn't have furrowed we mustn't have furrowed you mustn't have furrowed they mustn't have furrowed	I mustn't have been furrowing you mustn't have been furrowing he mustn't have been furrowing we mustn't have been furrowing you mustn't have been furrowing they mustn't have been furrowing

Interrogative form

Simple form	V-ing form
must I furrow? must you furrow? must he furrow? must we furrow? must you furrow? must they furrow?	must I be furrowing? must you be furrowing? must he be furrowing? must we be furrowing? must you be furrowing? must they be furrowing?
Perfect	V-ing perfect
must I have furrowed? must you have furrowed? must he have furrowed? must we have furrowed? must you have furrowed? must they have furrowed?	must I have been furrowing? must you have been furrowing? must he have been furrowing? must we have been furrowing? must you have been furrowing? must they have been furrowing?

Interro-negative form

Simple form	V-ing form
mustn't I furrow? mustn't you furrow? mustn't he furrow? mustn't we furrow? mustn't you furrow? mustn't they furrow?	mustn't I be furrowing? mustn't you be furrowing? mustn't he be furrowing? mustn't we be furrowing? mustn't you be furrowing? mustn't they be furrowing?
Perfect	V-ing perfect
mustn't I have furrowed? mustn't you have furrowed? mustn't he have furrowed? mustn't we have furrowed? mustn't you have furrowed? mustn't they have furrowed?	mustn't I have been furrowing? mustn't you have been furrowing? mustn't he have been furrowing? mustn't we have been furrowing? mustn't you have been furrowing? mustn't they have been furrowing?