I can fly-fish you can fly-fish he can fly-fish we can fly-fish you can fly-fish they can fly-fish
V-ing form
I can be fly-fishing you can be fly-fishing he can be fly-fishing we can be fly-fishing you can be fly-fishing they can be fly-fishing
Perfect
I can have fly-fished you can have fly-fished he can have fly-fished we can have fly-fished you can have fly-fished they can have fly-fished
V-ing perfect
I can have been fly-fishing you can have been fly-fishing he can have been fly-fishing we can have been fly-fishing you can have been fly-fishing they can have been fly-fishing
Negation
Simple form
I cannot fly-fish you cannot fly-fish he cannot fly-fish we cannot fly-fish you cannot fly-fish they cannot fly-fish
V-ing form
I cannot be fly-fishing you cannot be fly-fishing he cannot be fly-fishing we cannot be fly-fishing you cannot be fly-fishing they cannot be fly-fishing
Perfect
I cannot have fly-fished you cannot have fly-fished he cannot have fly-fished we cannot have fly-fished you cannot have fly-fished they cannot have fly-fished
V-ing perfect
I cannot have been fly-fishing you cannot have been fly-fishing he cannot have been fly-fishing we cannot have been fly-fishing you cannot have been fly-fishing they cannot have been fly-fishing
Interrogative form
Simple form
can I fly-fish? can you fly-fish? can he fly-fish? can we fly-fish? can you fly-fish? can they fly-fish?
V-ing form
can I be fly-fishing? can you be fly-fishing? can he be fly-fishing? can we be fly-fishing? can you be fly-fishing? can they be fly-fishing?
Perfect
can I have fly-fished? can you have fly-fished? can he have fly-fished? can we have fly-fished? can you have fly-fished? can they have fly-fished?
V-ing perfect
can I have been fly-fishing? can you have been fly-fishing? can he have been fly-fishing? can we have been fly-fishing? can you have been fly-fishing? can they have been fly-fishing?
Interro-negative form
Simple form
can I not fly-fish? can you not fly-fish? can he not fly-fish? can we not fly-fish? can you not fly-fish? can they not fly-fish?
V-ing form
can I not be fly-fishing? can you not be fly-fishing? can he not be fly-fishing? can we not be fly-fishing? can you not be fly-fishing? can they not be fly-fishing?
Perfect
can I not have fly-fished? can you not have fly-fished? can he not have fly-fished? can we not have fly-fished? can you not have fly-fished? can they not have fly-fished?
V-ing perfect
can I not have been fly-fishing? can you not have been fly-fishing? can he not have been fly-fishing? can we not have been fly-fishing? can you not have been fly-fishing? can they not have been fly-fishing?