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