I could decapitate you could decapitate she could decapitate we could decapitate you could decapitate they could decapitate
V-ing form
I could be decapitating you could be decapitating she could be decapitating we could be decapitating you could be decapitating they could be decapitating
Perfect
I could have decapitated you could have decapitated she could have decapitated we could have decapitated you could have decapitated they could have decapitated
V-ing perfect
I could have been decapitating you could have been decapitating she could have been decapitating we could have been decapitating you could have been decapitating they could have been decapitating
Negation
Simple form
I couldn't decapitate you couldn't decapitate she couldn't decapitate we couldn't decapitate you couldn't decapitate they couldn't decapitate
V-ing form
I couldn't be decapitating you couldn't be decapitating she couldn't be decapitating we couldn't be decapitating you couldn't be decapitating they couldn't be decapitating
Perfect
I couldn't have decapitated you couldn't have decapitated she couldn't have decapitated we couldn't have decapitated you couldn't have decapitated they couldn't have decapitated
V-ing perfect
I couldn't have been decapitating you couldn't have been decapitating she couldn't have been decapitating we couldn't have been decapitating you couldn't have been decapitating they couldn't have been decapitating
Interrogative form
Simple form
could I decapitate? could you decapitate? could she decapitate? could we decapitate? could you decapitate? could they decapitate?
V-ing form
could I be decapitating? could you be decapitating? could she be decapitating? could we be decapitating? could you be decapitating? could they be decapitating?
Perfect
could I have decapitated? could you have decapitated? could she have decapitated? could we have decapitated? could you have decapitated? could they have decapitated?
V-ing perfect
could I have been decapitating? could you have been decapitating? could she have been decapitating? could we have been decapitating? could you have been decapitating? could they have been decapitating?
Interro-negative form
Simple form
couldn't I decapitate? couldn't you decapitate? couldn't she decapitate? couldn't we decapitate? couldn't you decapitate? couldn't they decapitate?
V-ing form
couldn't I be decapitating? couldn't you be decapitating? couldn't she be decapitating? couldn't we be decapitating? couldn't you be decapitating? couldn't they be decapitating?
Perfect
couldn't I have decapitated? couldn't you have decapitated? couldn't she have decapitated? couldn't we have decapitated? couldn't you have decapitated? couldn't they have decapitated?
V-ing perfect
couldn't I have been decapitating? couldn't you have been decapitating? couldn't she have been decapitating? couldn't we have been decapitating? couldn't you have been decapitating? couldn't they have been decapitating?