I could skeletonize you could skeletonize he could skeletonize we could skeletonize you could skeletonize they could skeletonize
V-ing form
I could be skeletonizing you could be skeletonizing he could be skeletonizing we could be skeletonizing you could be skeletonizing they could be skeletonizing
Perfect
I could have skeletonized you could have skeletonized he could have skeletonized we could have skeletonized you could have skeletonized they could have skeletonized
V-ing perfect
I could have been skeletonizing you could have been skeletonizing he could have been skeletonizing we could have been skeletonizing you could have been skeletonizing they could have been skeletonizing
Negation
Simple form
I could not skeletonize you could not skeletonize he could not skeletonize we could not skeletonize you could not skeletonize they could not skeletonize
V-ing form
I could not be skeletonizing you could not be skeletonizing he could not be skeletonizing we could not be skeletonizing you could not be skeletonizing they could not be skeletonizing
Perfect
I could not have skeletonized you could not have skeletonized he could not have skeletonized we could not have skeletonized you could not have skeletonized they could not have skeletonized
V-ing perfect
I could not have been skeletonizing you could not have been skeletonizing he could not have been skeletonizing we could not have been skeletonizing you could not have been skeletonizing they could not have been skeletonizing
Interrogative form
Simple form
could I skeletonize? could you skeletonize? could he skeletonize? could we skeletonize? could you skeletonize? could they skeletonize?
V-ing form
could I be skeletonizing? could you be skeletonizing? could he be skeletonizing? could we be skeletonizing? could you be skeletonizing? could they be skeletonizing?
Perfect
could I have skeletonized? could you have skeletonized? could he have skeletonized? could we have skeletonized? could you have skeletonized? could they have skeletonized?
V-ing perfect
could I have been skeletonizing? could you have been skeletonizing? could he have been skeletonizing? could we have been skeletonizing? could you have been skeletonizing? could they have been skeletonizing?
Interro-negative form
Simple form
could I not skeletonize? could you not skeletonize? could he not skeletonize? could we not skeletonize? could you not skeletonize? could they not skeletonize?
V-ing form
could I not be skeletonizing? could you not be skeletonizing? could he not be skeletonizing? could we not be skeletonizing? could you not be skeletonizing? could they not be skeletonizing?
Perfect
could I not have skeletonized? could you not have skeletonized? could he not have skeletonized? could we not have skeletonized? could you not have skeletonized? could they not have skeletonized?
V-ing perfect
could I not have been skeletonizing? could you not have been skeletonizing? could he not have been skeletonizing? could we not have been skeletonizing? could you not have been skeletonizing? could they not have been skeletonizing?