I could demount you could demount he could demount we could demount you could demount they could demount
V-ing form
I could be demounting you could be demounting he could be demounting we could be demounting you could be demounting they could be demounting
Perfect
I could have demounted you could have demounted he could have demounted we could have demounted you could have demounted they could have demounted
V-ing perfect
I could have been demounting you could have been demounting he could have been demounting we could have been demounting you could have been demounting they could have been demounting
Negation
Simple form
I could not demount you could not demount he could not demount we could not demount you could not demount they could not demount
V-ing form
I could not be demounting you could not be demounting he could not be demounting we could not be demounting you could not be demounting they could not be demounting
Perfect
I could not have demounted you could not have demounted he could not have demounted we could not have demounted you could not have demounted they could not have demounted
V-ing perfect
I could not have been demounting you could not have been demounting he could not have been demounting we could not have been demounting you could not have been demounting they could not have been demounting
Interrogative form
Simple form
could I demount? could you demount? could he demount? could we demount? could you demount? could they demount?
V-ing form
could I be demounting? could you be demounting? could he be demounting? could we be demounting? could you be demounting? could they be demounting?
Perfect
could I have demounted? could you have demounted? could he have demounted? could we have demounted? could you have demounted? could they have demounted?
V-ing perfect
could I have been demounting? could you have been demounting? could he have been demounting? could we have been demounting? could you have been demounting? could they have been demounting?
Interro-negative form
Simple form
could I not demount? could you not demount? could he not demount? could we not demount? could you not demount? could they not demount?
V-ing form
could I not be demounting? could you not be demounting? could he not be demounting? could we not be demounting? could you not be demounting? could they not be demounting?
Perfect
could I not have demounted? could you not have demounted? could he not have demounted? could we not have demounted? could you not have demounted? could they not have demounted?
V-ing perfect
could I not have been demounting? could you not have been demounting? could he not have been demounting? could we not have been demounting? could you not have been demounting? could they not have been demounting?