I could alchemize you could alchemize he could alchemize we could alchemize you could alchemize they could alchemize
V-ing form
I could be alchemizing you could be alchemizing he could be alchemizing we could be alchemizing you could be alchemizing they could be alchemizing
Perfect
I could have alchemized you could have alchemized he could have alchemized we could have alchemized you could have alchemized they could have alchemized
V-ing perfect
I could have been alchemizing you could have been alchemizing he could have been alchemizing we could have been alchemizing you could have been alchemizing they could have been alchemizing
Negation
Simple form
I could not alchemize you could not alchemize he could not alchemize we could not alchemize you could not alchemize they could not alchemize
V-ing form
I could not be alchemizing you could not be alchemizing he could not be alchemizing we could not be alchemizing you could not be alchemizing they could not be alchemizing
Perfect
I could not have alchemized you could not have alchemized he could not have alchemized we could not have alchemized you could not have alchemized they could not have alchemized
V-ing perfect
I could not have been alchemizing you could not have been alchemizing he could not have been alchemizing we could not have been alchemizing you could not have been alchemizing they could not have been alchemizing
Interrogative form
Simple form
could I alchemize? could you alchemize? could he alchemize? could we alchemize? could you alchemize? could they alchemize?
V-ing form
could I be alchemizing? could you be alchemizing? could he be alchemizing? could we be alchemizing? could you be alchemizing? could they be alchemizing?
Perfect
could I have alchemized? could you have alchemized? could he have alchemized? could we have alchemized? could you have alchemized? could they have alchemized?
V-ing perfect
could I have been alchemizing? could you have been alchemizing? could he have been alchemizing? could we have been alchemizing? could you have been alchemizing? could they have been alchemizing?
Interro-negative form
Simple form
could I not alchemize? could you not alchemize? could he not alchemize? could we not alchemize? could you not alchemize? could they not alchemize?
V-ing form
could I not be alchemizing? could you not be alchemizing? could he not be alchemizing? could we not be alchemizing? could you not be alchemizing? could they not be alchemizing?
Perfect
could I not have alchemized? could you not have alchemized? could he not have alchemized? could we not have alchemized? could you not have alchemized? could they not have alchemized?
V-ing perfect
could I not have been alchemizing? could you not have been alchemizing? could he not have been alchemizing? could we not have been alchemizing? could you not have been alchemizing? could they not have been alchemizing?