I could cross-fertilize you could cross-fertilize he could cross-fertilize we could cross-fertilize you could cross-fertilize they could cross-fertilize
V-ing form
I could be cross-fertilizing you could be cross-fertilizing he could be cross-fertilizing we could be cross-fertilizing you could be cross-fertilizing they could be cross-fertilizing
Perfect
I could have cross-fertilized you could have cross-fertilized he could have cross-fertilized we could have cross-fertilized you could have cross-fertilized they could have cross-fertilized
V-ing perfect
I could have been cross-fertilizing you could have been cross-fertilizing he could have been cross-fertilizing we could have been cross-fertilizing you could have been cross-fertilizing they could have been cross-fertilizing
Negation
Simple form
I could not cross-fertilize you could not cross-fertilize he could not cross-fertilize we could not cross-fertilize you could not cross-fertilize they could not cross-fertilize
V-ing form
I could not be cross-fertilizing you could not be cross-fertilizing he could not be cross-fertilizing we could not be cross-fertilizing you could not be cross-fertilizing they could not be cross-fertilizing
Perfect
I could not have cross-fertilized you could not have cross-fertilized he could not have cross-fertilized we could not have cross-fertilized you could not have cross-fertilized they could not have cross-fertilized
V-ing perfect
I could not have been cross-fertilizing you could not have been cross-fertilizing he could not have been cross-fertilizing we could not have been cross-fertilizing you could not have been cross-fertilizing they could not have been cross-fertilizing
Interrogative form
Simple form
could I cross-fertilize? could you cross-fertilize? could he cross-fertilize? could we cross-fertilize? could you cross-fertilize? could they cross-fertilize?
V-ing form
could I be cross-fertilizing? could you be cross-fertilizing? could he be cross-fertilizing? could we be cross-fertilizing? could you be cross-fertilizing? could they be cross-fertilizing?
Perfect
could I have cross-fertilized? could you have cross-fertilized? could he have cross-fertilized? could we have cross-fertilized? could you have cross-fertilized? could they have cross-fertilized?
V-ing perfect
could I have been cross-fertilizing? could you have been cross-fertilizing? could he have been cross-fertilizing? could we have been cross-fertilizing? could you have been cross-fertilizing? could they have been cross-fertilizing?
Interro-negative form
Simple form
could I not cross-fertilize? could you not cross-fertilize? could he not cross-fertilize? could we not cross-fertilize? could you not cross-fertilize? could they not cross-fertilize?
V-ing form
could I not be cross-fertilizing? could you not be cross-fertilizing? could he not be cross-fertilizing? could we not be cross-fertilizing? could you not be cross-fertilizing? could they not be cross-fertilizing?
Perfect
could I not have cross-fertilized? could you not have cross-fertilized? could he not have cross-fertilized? could we not have cross-fertilized? could you not have cross-fertilized? could they not have cross-fertilized?
V-ing perfect
could I not have been cross-fertilizing? could you not have been cross-fertilizing? could he not have been cross-fertilizing? could we not have been cross-fertilizing? could you not have been cross-fertilizing? could they not have been cross-fertilizing?