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 couldn't skeletonize you couldn't skeletonize he couldn't skeletonize we couldn't skeletonize you couldn't skeletonize they couldn't skeletonize
V-ing form
I couldn't be skeletonizing you couldn't be skeletonizing he couldn't be skeletonizing we couldn't be skeletonizing you couldn't be skeletonizing they couldn't be skeletonizing
Perfect
I couldn't have skeletonized you couldn't have skeletonized he couldn't have skeletonized we couldn't have skeletonized you couldn't have skeletonized they couldn't have skeletonized
V-ing perfect
I couldn't have been skeletonizing you couldn't have been skeletonizing he couldn't have been skeletonizing we couldn't have been skeletonizing you couldn't have been skeletonizing they couldn't 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
couldn't I skeletonize? couldn't you skeletonize? couldn't he skeletonize? couldn't we skeletonize? couldn't you skeletonize? couldn't they skeletonize?
V-ing form
couldn't I be skeletonizing? couldn't you be skeletonizing? couldn't he be skeletonizing? couldn't we be skeletonizing? couldn't you be skeletonizing? couldn't they be skeletonizing?
Perfect
couldn't I have skeletonized? couldn't you have skeletonized? couldn't he have skeletonized? couldn't we have skeletonized? couldn't you have skeletonized? couldn't they have skeletonized?
V-ing perfect
couldn't I have been skeletonizing? couldn't you have been skeletonizing? couldn't he have been skeletonizing? couldn't we have been skeletonizing? couldn't you have been skeletonizing? couldn't they have been skeletonizing?