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