English verb conjugation
COULD OVERFISH

Regular verb: overfish - overfished - overfished

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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