English verb conjugation
MUST FISH

Regular verb: fish - fished - fished

Affirmation

Simple form	V-ing form
I must fish you must fish he must fish we must fish you must fish they must fish	I must be fishing you must be fishing he must be fishing we must be fishing you must be fishing they must be fishing
Perfect	V-ing perfect
I must have fished you must have fished he must have fished we must have fished you must have fished they must have fished	I must have been fishing you must have been fishing he must have been fishing we must have been fishing you must have been fishing they must have been fishing

Negation

Simple form	V-ing form
I mustn't fish you mustn't fish he mustn't fish we mustn't fish you mustn't fish they mustn't fish	I mustn't be fishing you mustn't be fishing he mustn't be fishing we mustn't be fishing you mustn't be fishing they mustn't be fishing
Perfect	V-ing perfect
I mustn't have fished you mustn't have fished he mustn't have fished we mustn't have fished you mustn't have fished they mustn't have fished	I mustn't have been fishing you mustn't have been fishing he mustn't have been fishing we mustn't have been fishing you mustn't have been fishing they mustn't have been fishing

Interrogative form

Simple form	V-ing form
must I fish? must you fish? must he fish? must we fish? must you fish? must they fish?	must I be fishing? must you be fishing? must he be fishing? must we be fishing? must you be fishing? must they be fishing?
Perfect	V-ing perfect
must I have fished? must you have fished? must he have fished? must we have fished? must you have fished? must they have fished?	must I have been fishing? must you have been fishing? must he have been fishing? must we have been fishing? must you have been fishing? must they have been fishing?

Interro-negative form

Simple form	V-ing form
mustn't I fish? mustn't you fish? mustn't he fish? mustn't we fish? mustn't you fish? mustn't they fish?	mustn't I be fishing? mustn't you be fishing? mustn't he be fishing? mustn't we be fishing? mustn't you be fishing? mustn't they be fishing?
Perfect	V-ing perfect
mustn't I have fished? mustn't you have fished? mustn't he have fished? mustn't we have fished? mustn't you have fished? mustn't they have fished?	mustn't I have been fishing? mustn't you have been fishing? mustn't he have been fishing? mustn't we have been fishing? mustn't you have been fishing? mustn't they have been fishing?