I could glaciate you could glaciate he could glaciate we could glaciate you could glaciate they could glaciate
V-ing form
I could be glaciating you could be glaciating he could be glaciating we could be glaciating you could be glaciating they could be glaciating
Perfect
I could have glaciated you could have glaciated he could have glaciated we could have glaciated you could have glaciated they could have glaciated
V-ing perfect
I could have been glaciating you could have been glaciating he could have been glaciating we could have been glaciating you could have been glaciating they could have been glaciating
Negation
Simple form
I could not glaciate you could not glaciate he could not glaciate we could not glaciate you could not glaciate they could not glaciate
V-ing form
I could not be glaciating you could not be glaciating he could not be glaciating we could not be glaciating you could not be glaciating they could not be glaciating
Perfect
I could not have glaciated you could not have glaciated he could not have glaciated we could not have glaciated you could not have glaciated they could not have glaciated
V-ing perfect
I could not have been glaciating you could not have been glaciating he could not have been glaciating we could not have been glaciating you could not have been glaciating they could not have been glaciating
Interrogative form
Simple form
could I glaciate? could you glaciate? could he glaciate? could we glaciate? could you glaciate? could they glaciate?
V-ing form
could I be glaciating? could you be glaciating? could he be glaciating? could we be glaciating? could you be glaciating? could they be glaciating?
Perfect
could I have glaciated? could you have glaciated? could he have glaciated? could we have glaciated? could you have glaciated? could they have glaciated?
V-ing perfect
could I have been glaciating? could you have been glaciating? could he have been glaciating? could we have been glaciating? could you have been glaciating? could they have been glaciating?
Interro-negative form
Simple form
could I not glaciate? could you not glaciate? could he not glaciate? could we not glaciate? could you not glaciate? could they not glaciate?
V-ing form
could I not be glaciating? could you not be glaciating? could he not be glaciating? could we not be glaciating? could you not be glaciating? could they not be glaciating?
Perfect
could I not have glaciated? could you not have glaciated? could he not have glaciated? could we not have glaciated? could you not have glaciated? could they not have glaciated?
V-ing perfect
could I not have been glaciating? could you not have been glaciating? could he not have been glaciating? could we not have been glaciating? could you not have been glaciating? could they not have been glaciating?