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 couldn't alchemize you couldn't alchemize he couldn't alchemize we couldn't alchemize you couldn't alchemize they couldn't alchemize
V-ing form
I couldn't be alchemizing you couldn't be alchemizing he couldn't be alchemizing we couldn't be alchemizing you couldn't be alchemizing they couldn't be alchemizing
Perfect
I couldn't have alchemized you couldn't have alchemized he couldn't have alchemized we couldn't have alchemized you couldn't have alchemized they couldn't have alchemized
V-ing perfect
I couldn't have been alchemizing you couldn't have been alchemizing he couldn't have been alchemizing we couldn't have been alchemizing you couldn't have been alchemizing they couldn't 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
couldn't I alchemize? couldn't you alchemize? couldn't he alchemize? couldn't we alchemize? couldn't you alchemize? couldn't they alchemize?
V-ing form
couldn't I be alchemizing? couldn't you be alchemizing? couldn't he be alchemizing? couldn't we be alchemizing? couldn't you be alchemizing? couldn't they be alchemizing?
Perfect
couldn't I have alchemized? couldn't you have alchemized? couldn't he have alchemized? couldn't we have alchemized? couldn't you have alchemized? couldn't they have alchemized?
V-ing perfect
couldn't I have been alchemizing? couldn't you have been alchemizing? couldn't he have been alchemizing? couldn't we have been alchemizing? couldn't you have been alchemizing? couldn't they have been alchemizing?