I could depreciate you could depreciate he could depreciate we could depreciate you could depreciate they could depreciate
V-ing form
I could be depreciating you could be depreciating he could be depreciating we could be depreciating you could be depreciating they could be depreciating
Perfect
I could have depreciated you could have depreciated he could have depreciated we could have depreciated you could have depreciated they could have depreciated
V-ing perfect
I could have been depreciating you could have been depreciating he could have been depreciating we could have been depreciating you could have been depreciating they could have been depreciating
Negation
Simple form
I could not depreciate you could not depreciate he could not depreciate we could not depreciate you could not depreciate they could not depreciate
V-ing form
I could not be depreciating you could not be depreciating he could not be depreciating we could not be depreciating you could not be depreciating they could not be depreciating
Perfect
I could not have depreciated you could not have depreciated he could not have depreciated we could not have depreciated you could not have depreciated they could not have depreciated
V-ing perfect
I could not have been depreciating you could not have been depreciating he could not have been depreciating we could not have been depreciating you could not have been depreciating they could not have been depreciating
Interrogative form
Simple form
could I depreciate? could you depreciate? could he depreciate? could we depreciate? could you depreciate? could they depreciate?
V-ing form
could I be depreciating? could you be depreciating? could he be depreciating? could we be depreciating? could you be depreciating? could they be depreciating?
Perfect
could I have depreciated? could you have depreciated? could he have depreciated? could we have depreciated? could you have depreciated? could they have depreciated?
V-ing perfect
could I have been depreciating? could you have been depreciating? could he have been depreciating? could we have been depreciating? could you have been depreciating? could they have been depreciating?
Interro-negative form
Simple form
could I not depreciate? could you not depreciate? could he not depreciate? could we not depreciate? could you not depreciate? could they not depreciate?
V-ing form
could I not be depreciating? could you not be depreciating? could he not be depreciating? could we not be depreciating? could you not be depreciating? could they not be depreciating?
Perfect
could I not have depreciated? could you not have depreciated? could he not have depreciated? could we not have depreciated? could you not have depreciated? could they not have depreciated?
V-ing perfect
could I not have been depreciating? could you not have been depreciating? could he not have been depreciating? could we not have been depreciating? could you not have been depreciating? could they not have been depreciating?