I must fly-fish you must fly-fish he must fly-fish we must fly-fish you must fly-fish they must fly-fish
V-ing form
I must be fly-fishing you must be fly-fishing he must be fly-fishing we must be fly-fishing you must be fly-fishing they must be fly-fishing
Perfect
I must have fly-fished you must have fly-fished he must have fly-fished we must have fly-fished you must have fly-fished they must have fly-fished
V-ing perfect
I must have been fly-fishing you must have been fly-fishing he must have been fly-fishing we must have been fly-fishing you must have been fly-fishing they must have been fly-fishing
Negation
Simple form
I mustn't fly-fish you mustn't fly-fish he mustn't fly-fish we mustn't fly-fish you mustn't fly-fish they mustn't fly-fish
V-ing form
I mustn't be fly-fishing you mustn't be fly-fishing he mustn't be fly-fishing we mustn't be fly-fishing you mustn't be fly-fishing they mustn't be fly-fishing
Perfect
I mustn't have fly-fished you mustn't have fly-fished he mustn't have fly-fished we mustn't have fly-fished you mustn't have fly-fished they mustn't have fly-fished
V-ing perfect
I mustn't have been fly-fishing you mustn't have been fly-fishing he mustn't have been fly-fishing we mustn't have been fly-fishing you mustn't have been fly-fishing they mustn't have been fly-fishing
Interrogative form
Simple form
must I fly-fish? must you fly-fish? must he fly-fish? must we fly-fish? must you fly-fish? must they fly-fish?
V-ing form
must I be fly-fishing? must you be fly-fishing? must he be fly-fishing? must we be fly-fishing? must you be fly-fishing? must they be fly-fishing?
Perfect
must I have fly-fished? must you have fly-fished? must he have fly-fished? must we have fly-fished? must you have fly-fished? must they have fly-fished?
V-ing perfect
must I have been fly-fishing? must you have been fly-fishing? must he have been fly-fishing? must we have been fly-fishing? must you have been fly-fishing? must they have been fly-fishing?
Interro-negative form
Simple form
mustn't I fly-fish? mustn't you fly-fish? mustn't he fly-fish? mustn't we fly-fish? mustn't you fly-fish? mustn't they fly-fish?
V-ing form
mustn't I be fly-fishing? mustn't you be fly-fishing? mustn't he be fly-fishing? mustn't we be fly-fishing? mustn't you be fly-fishing? mustn't they be fly-fishing?
Perfect
mustn't I have fly-fished? mustn't you have fly-fished? mustn't he have fly-fished? mustn't we have fly-fished? mustn't you have fly-fished? mustn't they have fly-fished?
V-ing perfect
mustn't I have been fly-fishing? mustn't you have been fly-fishing? mustn't he have been fly-fishing? mustn't we have been fly-fishing? mustn't you have been fly-fishing? mustn't they have been fly-fishing?