English verb conjugation
COULD FLY-FISH

Regular verb: fly-fish - fly-fished - fly-fished

Affirmation

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