English verb conjugation
CAN FISH

Regular verb: fish - fished - fished

Affirmation

Simple form	V-ing form
I can fish you can fish he can fish we can fish you can fish they can fish	I can be fishing you can be fishing he can be fishing we can be fishing you can be fishing they can be fishing
Perfect	V-ing perfect
I can have fished you can have fished he can have fished we can have fished you can have fished they can have fished	I can have been fishing you can have been fishing he can have been fishing we can have been fishing you can have been fishing they can have been fishing

Negation

Simple form	V-ing form
I cannot fish you cannot fish he cannot fish we cannot fish you cannot fish they cannot fish	I cannot be fishing you cannot be fishing he cannot be fishing we cannot be fishing you cannot be fishing they cannot be fishing
Perfect	V-ing perfect
I cannot have fished you cannot have fished he cannot have fished we cannot have fished you cannot have fished they cannot have fished	I cannot have been fishing you cannot have been fishing he cannot have been fishing we cannot have been fishing you cannot have been fishing they cannot have been fishing

Interrogative form

Simple form	V-ing form
can I fish? can you fish? can he fish? can we fish? can you fish? can they fish?	can I be fishing? can you be fishing? can he be fishing? can we be fishing? can you be fishing? can they be fishing?
Perfect	V-ing perfect
can I have fished? can you have fished? can he have fished? can we have fished? can you have fished? can they have fished?	can I have been fishing? can you have been fishing? can he have been fishing? can we have been fishing? can you have been fishing? can they have been fishing?

Interro-negative form

Simple form	V-ing form
can I not fish? can you not fish? can he not fish? can we not fish? can you not fish? can they not fish?	can I not be fishing? can you not be fishing? can he not be fishing? can we not be fishing? can you not be fishing? can they not be fishing?
Perfect	V-ing perfect
can I not have fished? can you not have fished? can he not have fished? can we not have fished? can you not have fished? can they not have fished?	can I not have been fishing? can you not have been fishing? can he not have been fishing? can we not have been fishing? can you not have been fishing? can they not have been fishing?