must furrow
Regular verb: furrow - furrowed- furrowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?