English verb conjugation
COULD OVERFERTILIZE

Regular verb: overfertilize - overfertilized - overfertilized

Affirmation

Simple form	V-ing form
I could overfertilize you could overfertilize he could overfertilize we could overfertilize you could overfertilize they could overfertilize	I could be overfertilizing you could be overfertilizing he could be overfertilizing we could be overfertilizing you could be overfertilizing they could be overfertilizing
Perfect	V-ing perfect
I could have overfertilized you could have overfertilized he could have overfertilized we could have overfertilized you could have overfertilized they could have overfertilized	I could have been overfertilizing you could have been overfertilizing he could have been overfertilizing we could have been overfertilizing you could have been overfertilizing they could have been overfertilizing

Negation

Simple form	V-ing form
I could not overfertilize you could not overfertilize he could not overfertilize we could not overfertilize you could not overfertilize they could not overfertilize	I could not be overfertilizing you could not be overfertilizing he could not be overfertilizing we could not be overfertilizing you could not be overfertilizing they could not be overfertilizing
Perfect	V-ing perfect
I could not have overfertilized you could not have overfertilized he could not have overfertilized we could not have overfertilized you could not have overfertilized they could not have overfertilized	I could not have been overfertilizing you could not have been overfertilizing he could not have been overfertilizing we could not have been overfertilizing you could not have been overfertilizing they could not have been overfertilizing

Interrogative form

Simple form	V-ing form
could I overfertilize? could you overfertilize? could he overfertilize? could we overfertilize? could you overfertilize? could they overfertilize?	could I be overfertilizing? could you be overfertilizing? could he be overfertilizing? could we be overfertilizing? could you be overfertilizing? could they be overfertilizing?
Perfect	V-ing perfect
could I have overfertilized? could you have overfertilized? could he have overfertilized? could we have overfertilized? could you have overfertilized? could they have overfertilized?	could I have been overfertilizing? could you have been overfertilizing? could he have been overfertilizing? could we have been overfertilizing? could you have been overfertilizing? could they have been overfertilizing?

Interro-negative form

Simple form	V-ing form
could I not overfertilize? could you not overfertilize? could he not overfertilize? could we not overfertilize? could you not overfertilize? could they not overfertilize?	could I not be overfertilizing? could you not be overfertilizing? could he not be overfertilizing? could we not be overfertilizing? could you not be overfertilizing? could they not be overfertilizing?
Perfect	V-ing perfect
could I not have overfertilized? could you not have overfertilized? could he not have overfertilized? could we not have overfertilized? could you not have overfertilized? could they not have overfertilized?	could I not have been overfertilizing? could you not have been overfertilizing? could he not have been overfertilizing? could we not have been overfertilizing? could you not have been overfertilizing? could they not have been overfertilizing?