English verb conjugation
COULD BLACKBALL

Regular verb: blackball - blackballed - blackballed

Affirmation

Simple form	V-ing form
I could blackball you could blackball he could blackball we could blackball you could blackball they could blackball	I could be blackballing you could be blackballing he could be blackballing we could be blackballing you could be blackballing they could be blackballing
Perfect	V-ing perfect
I could have blackballed you could have blackballed he could have blackballed we could have blackballed you could have blackballed they could have blackballed	I could have been blackballing you could have been blackballing he could have been blackballing we could have been blackballing you could have been blackballing they could have been blackballing

Negation

Simple form	V-ing form
I could not blackball you could not blackball he could not blackball we could not blackball you could not blackball they could not blackball	I could not be blackballing you could not be blackballing he could not be blackballing we could not be blackballing you could not be blackballing they could not be blackballing
Perfect	V-ing perfect
I could not have blackballed you could not have blackballed he could not have blackballed we could not have blackballed you could not have blackballed they could not have blackballed	I could not have been blackballing you could not have been blackballing he could not have been blackballing we could not have been blackballing you could not have been blackballing they could not have been blackballing

Interrogative form

Simple form	V-ing form
could I blackball? could you blackball? could he blackball? could we blackball? could you blackball? could they blackball?	could I be blackballing? could you be blackballing? could he be blackballing? could we be blackballing? could you be blackballing? could they be blackballing?
Perfect	V-ing perfect
could I have blackballed? could you have blackballed? could he have blackballed? could we have blackballed? could you have blackballed? could they have blackballed?	could I have been blackballing? could you have been blackballing? could he have been blackballing? could we have been blackballing? could you have been blackballing? could they have been blackballing?

Interro-negative form

Simple form	V-ing form
could I not blackball? could you not blackball? could he not blackball? could we not blackball? could you not blackball? could they not blackball?	could I not be blackballing? could you not be blackballing? could he not be blackballing? could we not be blackballing? could you not be blackballing? could they not be blackballing?
Perfect	V-ing perfect
could I not have blackballed? could you not have blackballed? could he not have blackballed? could we not have blackballed? could you not have blackballed? could they not have blackballed?	could I not have been blackballing? could you not have been blackballing? could he not have been blackballing? could we not have been blackballing? could you not have been blackballing? could they not have been blackballing?