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

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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? 	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? 	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?