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 couldn't blackball you couldn't blackball he couldn't blackball we couldn't blackball you couldn't blackball they couldn't blackball	I couldn't be blackballing you couldn't be blackballing he couldn't be blackballing we couldn't be blackballing you couldn't be blackballing they couldn't be blackballing
Perfect	V-ing perfect
I couldn't have blackballed you couldn't have blackballed he couldn't have blackballed we couldn't have blackballed you couldn't have blackballed they couldn't have blackballed	I couldn't have been blackballing you couldn't have been blackballing he 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	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
couldn't I blackball? couldn't you blackball? couldn't he blackball? couldn't we blackball? couldn't you blackball? couldn't they blackball?	couldn't I be blackballing? couldn't you be blackballing? couldn't he be blackballing? couldn't we be blackballing? couldn't you be blackballing? couldn't they be blackballing?
Perfect	V-ing perfect
couldn't I have blackballed? couldn't you have blackballed? couldn't he have blackballed? couldn't we have blackballed? couldn't you have blackballed? couldn't they have blackballed?	couldn't I have been blackballing? couldn't you have been blackballing? couldn't he have been blackballing? couldn't we have been blackballing? couldn't you have been blackballing? couldn't they have been blackballing?