English verb conjugation
CAN OVERFISH

Regular verb: overfish - overfished - overfished

Affirmation

Simple form	V-ing form
I can overfish you can overfish he can overfish we can overfish you can overfish they can overfish	I can be overfishing you can be overfishing he can be overfishing we can be overfishing you can be overfishing they can be overfishing
Perfect	V-ing perfect
I can have overfished you can have overfished he can have overfished we can have overfished you can have overfished they can have overfished	I can have been overfishing you can have been overfishing he can have been overfishing we can have been overfishing you can have been overfishing they can have been overfishing

Negation

Simple form	V-ing form
I can't overfish you can't overfish he can't overfish we can't overfish you can't overfish they can't overfish	I can't be overfishing you can't be overfishing he can't be overfishing we can't be overfishing you can't be overfishing they can't be overfishing
Perfect	V-ing perfect
I can't have overfished you can't have overfished he can't have overfished we can't have overfished you can't have overfished they can't have overfished	I can't have been overfishing you can't have been overfishing he can't have been overfishing we can't have been overfishing you can't have been overfishing they can't have been overfishing

Interrogative form

Simple form	V-ing form
can I overfish? can you overfish? can he overfish? can we overfish? can you overfish? can they overfish?	can I be overfishing? can you be overfishing? can he be overfishing? can we be overfishing? can you be overfishing? can they be overfishing?
Perfect	V-ing perfect
can I have overfished? can you have overfished? can he have overfished? can we have overfished? can you have overfished? can they have overfished?	can I have been overfishing? can you have been overfishing? can he have been overfishing? can we have been overfishing? can you have been overfishing? can they have been overfishing?

Interro-negative form

Simple form	V-ing form
can't I overfish? can't you overfish? can't he overfish? can't we overfish? can't you overfish? can't they overfish?	can't I be overfishing? can't you be overfishing? can't he be overfishing? can't we be overfishing? can't you be overfishing? can't they be overfishing?
Perfect	V-ing perfect
can't I have overfished? can't you have overfished? can't he have overfished? can't we have overfished? can't you have overfished? can't they have overfished?	can't I have been overfishing? can't you have been overfishing? can't he have been overfishing? can't we have been overfishing? can't you have been overfishing? can't they have been overfishing?