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 must not fish you must not fish he must not fish we must not fish you must not fish they must not fish	I must not be fishing you must not be fishing he must not be fishing we must not be fishing you must not be fishing they must not be fishing
Perfect	V-ing perfect
I must not have fished you must not have fished he must not have fished we must not have fished you must not have fished they must not have fished	I must not have been fishing you must not have been fishing he must not have been fishing we must not have been fishing you must not have been fishing they must not 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
must I not fish? must you not fish? must he not fish? must we not fish? must you not fish? must they not fish?	must I not be fishing? must you not be fishing? must he not be fishing? must we not be fishing? must you not be fishing? must they not be fishing?
Perfect	V-ing perfect
must I not have fished? must you not have fished? must he not have fished? must we not have fished? must you not have fished? must they not have fished?	must I not have been fishing? must you not have been fishing? must he not have been fishing? must we not have been fishing? must you not have been fishing? must they not have been fishing?