English verb conjugation
COULD RETROACT

Regular verb: retroact - retroacted - retroacted

Affirmation

Simple form	V-ing form
I could retroact you could retroact he could retroact we could retroact you could retroact they could retroact	I could be retroacting you could be retroacting he could be retroacting we could be retroacting you could be retroacting they could be retroacting
Perfect	V-ing perfect
I could have retroacted you could have retroacted he could have retroacted we could have retroacted you could have retroacted they could have retroacted	I could have been retroacting you could have been retroacting he could have been retroacting we could have been retroacting you could have been retroacting they could have been retroacting

Negation

Simple form	V-ing form
I could not retroact you could not retroact he could not retroact we could not retroact you could not retroact they could not retroact	I could not be retroacting you could not be retroacting he could not be retroacting we could not be retroacting you could not be retroacting they could not be retroacting
Perfect	V-ing perfect
I could not have retroacted you could not have retroacted he could not have retroacted we could not have retroacted you could not have retroacted they could not have retroacted	I could not have been retroacting you could not have been retroacting he could not have been retroacting we could not have been retroacting you could not have been retroacting they could not have been retroacting

Interrogative form

Simple form	V-ing form
could I retroact? could you retroact? could he retroact? could we retroact? could you retroact? could they retroact?	could I be retroacting? could you be retroacting? could he be retroacting? could we be retroacting? could you be retroacting? could they be retroacting?
Perfect	V-ing perfect
could I have retroacted? could you have retroacted? could he have retroacted? could we have retroacted? could you have retroacted? could they have retroacted?	could I have been retroacting? could you have been retroacting? could he have been retroacting? could we have been retroacting? could you have been retroacting? could they have been retroacting?

Interro-negative form

Simple form	V-ing form
could I not retroact? could you not retroact? could he not retroact? could we not retroact? could you not retroact? could they not retroact?	could I not be retroacting? could you not be retroacting? could he not be retroacting? could we not be retroacting? could you not be retroacting? could they not be retroacting?
Perfect	V-ing perfect
could I not have retroacted? could you not have retroacted? could he not have retroacted? could we not have retroacted? could you not have retroacted? could they not have retroacted?	could I not have been retroacting? could you not have been retroacting? could he not have been retroacting? could we not have been retroacting? could you not have been retroacting? could they not have been retroacting?