must overfish
Regular verb: overfish - overfished- overfished

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must overfish
you must overfish
he must overfish
we must overfish
you must overfish
they must overfish 	I must be overfishing
you must be overfishing
he must be overfishing
we must be overfishing
you must be overfishing
they must be overfishing	I must have overfished
you must have overfished
he must have overfished
we must have overfished
you must have overfished
they must have overfished	I must have been overfishing
you must have been overfishing
he must have been overfishing
we must have been overfishing
you must have been overfishing
they must have been overfishing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't overfish
you mustn't overfish
he mustn't overfish
we mustn't overfish
you mustn't overfish
they mustn't overfish 	I mustn't be overfishing
you mustn't be overfishing
he mustn't be overfishing
we mustn't be overfishing
you mustn't be overfishing
they mustn't be overfishing	I mustn't have overfished
you mustn't have overfished
he mustn't have overfished
we mustn't have overfished
you mustn't have overfished
they mustn't have overfished	I mustn't have been overfishing
you mustn't have been overfishing
he mustn't have been overfishing
we mustn't have been overfishing
you mustn't have been overfishing
they mustn't have been overfishing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I overfish?
must you overfish?
must he overfish?
must we overfish?
must you overfish?
must they overfish? 	must I be overfishing?
must you be overfishing?
must he be overfishing?
must we be overfishing?
must you be overfishing?
must they be overfishing? 	must I have overfished?
must you have overfished?
must he have overfished?
must we have overfished?
must you have overfished?
must they have overfished? 	must I have been overfishing?
must you have been overfishing?
must he have been overfishing?
must we have been overfishing?
must you have been overfishing?
must they have been overfishing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I overfish?
mustn't you overfish?
mustn't he overfish?
mustn't we overfish?
mustn't you overfish?
mustn't they overfish? 	mustn't I be overfishing?
mustn't you be overfishing?
mustn't he be overfishing?
mustn't we be overfishing?
mustn't you be overfishing?
mustn't they be overfishing? 	mustn't I have overfished?
mustn't you have overfished?
mustn't he have overfished?
mustn't we have overfished?
mustn't you have overfished?
mustn't they have overfished? 	mustn't I have been overfishing?
mustn't you have been overfishing?
mustn't he have been overfishing?
mustn't we have been overfishing?
mustn't you have been overfishing?
mustn't they have been overfishing?