I could remove you could remove she could remove we could remove you could remove they could remove
V-ing form
I could be removing you could be removing she could be removing we could be removing you could be removing they could be removing
Perfect
I could have removed you could have removed she could have removed we could have removed you could have removed they could have removed
V-ing perfect
I could have been removing you could have been removing she could have been removing we could have been removing you could have been removing they could have been removing
Negation
Simple form
I could not remove you could not remove she could not remove we could not remove you could not remove they could not remove
V-ing form
I could not be removing you could not be removing she could not be removing we could not be removing you could not be removing they could not be removing
Perfect
I could not have removed you could not have removed she could not have removed we could not have removed you could not have removed they could not have removed
V-ing perfect
I could not have been removing you could not have been removing she could not have been removing we could not have been removing you could not have been removing they could not have been removing
Interrogative form
Simple form
could I remove? could you remove? could she remove? could we remove? could you remove? could they remove?
V-ing form
could I be removing? could you be removing? could she be removing? could we be removing? could you be removing? could they be removing?
Perfect
could I have removed? could you have removed? could she have removed? could we have removed? could you have removed? could they have removed?
V-ing perfect
could I have been removing? could you have been removing? could she have been removing? could we have been removing? could you have been removing? could they have been removing?
Interro-negative form
Simple form
could I not remove? could you not remove? could she not remove? could we not remove? could you not remove? could they not remove?
V-ing form
could I not be removing? could you not be removing? could she not be removing? could we not be removing? could you not be removing? could they not be removing?
Perfect
could I not have removed? could you not have removed? could she not have removed? could we not have removed? could you not have removed? could they not have removed?
V-ing perfect
could I not have been removing? could you not have been removing? could she not have been removing? could we not have been removing? could you not have been removing? could they not have been removing?