I could circumstantiate you could circumstantiate he could circumstantiate we could circumstantiate you could circumstantiate they could circumstantiate
V-ing form
I could be circumstantiating you could be circumstantiating he could be circumstantiating we could be circumstantiating you could be circumstantiating they could be circumstantiating
Perfect
I could have circumstantiated you could have circumstantiated he could have circumstantiated we could have circumstantiated you could have circumstantiated they could have circumstantiated
V-ing perfect
I could have been circumstantiating you could have been circumstantiating he could have been circumstantiating we could have been circumstantiating you could have been circumstantiating they could have been circumstantiating
Negation
Simple form
I could not circumstantiate you could not circumstantiate he could not circumstantiate we could not circumstantiate you could not circumstantiate they could not circumstantiate
V-ing form
I could not be circumstantiating you could not be circumstantiating he could not be circumstantiating we could not be circumstantiating you could not be circumstantiating they could not be circumstantiating
Perfect
I could not have circumstantiated you could not have circumstantiated he could not have circumstantiated we could not have circumstantiated you could not have circumstantiated they could not have circumstantiated
V-ing perfect
I could not have been circumstantiating you could not have been circumstantiating he could not have been circumstantiating we could not have been circumstantiating you could not have been circumstantiating they could not have been circumstantiating
Interrogative form
Simple form
could I circumstantiate? could you circumstantiate? could he circumstantiate? could we circumstantiate? could you circumstantiate? could they circumstantiate?
V-ing form
could I be circumstantiating? could you be circumstantiating? could he be circumstantiating? could we be circumstantiating? could you be circumstantiating? could they be circumstantiating?
Perfect
could I have circumstantiated? could you have circumstantiated? could he have circumstantiated? could we have circumstantiated? could you have circumstantiated? could they have circumstantiated?
V-ing perfect
could I have been circumstantiating? could you have been circumstantiating? could he have been circumstantiating? could we have been circumstantiating? could you have been circumstantiating? could they have been circumstantiating?
Interro-negative form
Simple form
could I not circumstantiate? could you not circumstantiate? could he not circumstantiate? could we not circumstantiate? could you not circumstantiate? could they not circumstantiate?
V-ing form
could I not be circumstantiating? could you not be circumstantiating? could he not be circumstantiating? could we not be circumstantiating? could you not be circumstantiating? could they not be circumstantiating?
Perfect
could I not have circumstantiated? could you not have circumstantiated? could he not have circumstantiated? could we not have circumstantiated? could you not have circumstantiated? could they not have circumstantiated?
V-ing perfect
could I not have been circumstantiating? could you not have been circumstantiating? could he not have been circumstantiating? could we not have been circumstantiating? could you not have been circumstantiating? could they not have been circumstantiating?