I could schematize you could schematize he could schematize we could schematize you could schematize they could schematize
V-ing form
I could be schematizing you could be schematizing he could be schematizing we could be schematizing you could be schematizing they could be schematizing
Perfect
I could have schematized you could have schematized he could have schematized we could have schematized you could have schematized they could have schematized
V-ing perfect
I could have been schematizing you could have been schematizing he could have been schematizing we could have been schematizing you could have been schematizing they could have been schematizing
Negation
Simple form
I could not schematize you could not schematize he could not schematize we could not schematize you could not schematize they could not schematize
V-ing form
I could not be schematizing you could not be schematizing he could not be schematizing we could not be schematizing you could not be schematizing they could not be schematizing
Perfect
I could not have schematized you could not have schematized he could not have schematized we could not have schematized you could not have schematized they could not have schematized
V-ing perfect
I could not have been schematizing you could not have been schematizing he could not have been schematizing we could not have been schematizing you could not have been schematizing they could not have been schematizing
Interrogative form
Simple form
could I schematize? could you schematize? could he schematize? could we schematize? could you schematize? could they schematize?
V-ing form
could I be schematizing? could you be schematizing? could he be schematizing? could we be schematizing? could you be schematizing? could they be schematizing?
Perfect
could I have schematized? could you have schematized? could he have schematized? could we have schematized? could you have schematized? could they have schematized?
V-ing perfect
could I have been schematizing? could you have been schematizing? could he have been schematizing? could we have been schematizing? could you have been schematizing? could they have been schematizing?
Interro-negative form
Simple form
could I not schematize? could you not schematize? could he not schematize? could we not schematize? could you not schematize? could they not schematize?
V-ing form
could I not be schematizing? could you not be schematizing? could he not be schematizing? could we not be schematizing? could you not be schematizing? could they not be schematizing?
Perfect
could I not have schematized? could you not have schematized? could he not have schematized? could we not have schematized? could you not have schematized? could they not have schematized?
V-ing perfect
could I not have been schematizing? could you not have been schematizing? could he not have been schematizing? could we not have been schematizing? could you not have been schematizing? could they not have been schematizing?