I could fly-fish you could fly-fish she 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 she 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 she 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 she 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 couldn't fly-fish you couldn't fly-fish she couldn't fly-fish we couldn't fly-fish you couldn't fly-fish they couldn't fly-fish
V-ing form
I couldn't be fly-fishing you couldn't be fly-fishing she couldn't be fly-fishing we couldn't be fly-fishing you couldn't be fly-fishing they couldn't be fly-fishing
Perfect
I couldn't have fly-fished you couldn't have fly-fished she couldn't have fly-fished we couldn't have fly-fished you couldn't have fly-fished they couldn't have fly-fished
V-ing perfect
I couldn't have been fly-fishing you couldn't have been fly-fishing she couldn't have been fly-fishing we couldn't have been fly-fishing you couldn't have been fly-fishing they couldn't have been fly-fishing
Interrogative form
Simple form
could I fly-fish? could you fly-fish? could she 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 she 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 she 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 she 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
couldn't I fly-fish? couldn't you fly-fish? couldn't she fly-fish? couldn't we fly-fish? couldn't you fly-fish? couldn't they fly-fish?
V-ing form
couldn't I be fly-fishing? couldn't you be fly-fishing? couldn't she be fly-fishing? couldn't we be fly-fishing? couldn't you be fly-fishing? couldn't they be fly-fishing?
Perfect
couldn't I have fly-fished? couldn't you have fly-fished? couldn't she have fly-fished? couldn't we have fly-fished? couldn't you have fly-fished? couldn't they have fly-fished?
V-ing perfect
couldn't I have been fly-fishing? couldn't you have been fly-fishing? couldn't she have been fly-fishing? couldn't we have been fly-fishing? couldn't you have been fly-fishing? couldn't they have been fly-fishing?