I could prefertilize you could prefertilize he could prefertilize we could prefertilize you could prefertilize they could prefertilize
V-ing form
I could be prefertilizing you could be prefertilizing he could be prefertilizing we could be prefertilizing you could be prefertilizing they could be prefertilizing
Perfect
I could have prefertilized you could have prefertilized he could have prefertilized we could have prefertilized you could have prefertilized they could have prefertilized
V-ing perfect
I could have been prefertilizing you could have been prefertilizing he could have been prefertilizing we could have been prefertilizing you could have been prefertilizing they could have been prefertilizing
Negation
Simple form
I could not prefertilize you could not prefertilize he could not prefertilize we could not prefertilize you could not prefertilize they could not prefertilize
V-ing form
I could not be prefertilizing you could not be prefertilizing he could not be prefertilizing we could not be prefertilizing you could not be prefertilizing they could not be prefertilizing
Perfect
I could not have prefertilized you could not have prefertilized he could not have prefertilized we could not have prefertilized you could not have prefertilized they could not have prefertilized
V-ing perfect
I could not have been prefertilizing you could not have been prefertilizing he could not have been prefertilizing we could not have been prefertilizing you could not have been prefertilizing they could not have been prefertilizing
Interrogative form
Simple form
could I prefertilize? could you prefertilize? could he prefertilize? could we prefertilize? could you prefertilize? could they prefertilize?
V-ing form
could I be prefertilizing? could you be prefertilizing? could he be prefertilizing? could we be prefertilizing? could you be prefertilizing? could they be prefertilizing?
Perfect
could I have prefertilized? could you have prefertilized? could he have prefertilized? could we have prefertilized? could you have prefertilized? could they have prefertilized?
V-ing perfect
could I have been prefertilizing? could you have been prefertilizing? could he have been prefertilizing? could we have been prefertilizing? could you have been prefertilizing? could they have been prefertilizing?
Interro-negative form
Simple form
could I not prefertilize? could you not prefertilize? could he not prefertilize? could we not prefertilize? could you not prefertilize? could they not prefertilize?
V-ing form
could I not be prefertilizing? could you not be prefertilizing? could he not be prefertilizing? could we not be prefertilizing? could you not be prefertilizing? could they not be prefertilizing?
Perfect
could I not have prefertilized? could you not have prefertilized? could he not have prefertilized? could we not have prefertilized? could you not have prefertilized? could they not have prefertilized?
V-ing perfect
could I not have been prefertilizing? could you not have been prefertilizing? could he not have been prefertilizing? could we not have been prefertilizing? could you not have been prefertilizing? could they not have been prefertilizing?