English verb conjugation
COULD RETROACT

Regular verb: retroact - retroacted - retroacted

Affirmation

Simple form	V-ing form
I could retroact you could retroact she could retroact we could retroact you could retroact they could retroact	I could be retroacting you could be retroacting she 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 she 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 she 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 couldn't retroact you couldn't retroact she couldn't retroact we couldn't retroact you couldn't retroact they couldn't retroact	I couldn't be retroacting you couldn't be retroacting she couldn't be retroacting we couldn't be retroacting you couldn't be retroacting they couldn't be retroacting
Perfect	V-ing perfect
I couldn't have retroacted you couldn't have retroacted she couldn't have retroacted we couldn't have retroacted you couldn't have retroacted they couldn't have retroacted	I couldn't have been retroacting you couldn't have been retroacting she couldn't have been retroacting we couldn't have been retroacting you couldn't have been retroacting they couldn't have been retroacting

Interrogative form

Simple form	V-ing form
could I retroact? could you retroact? could she retroact? could we retroact? could you retroact? could they retroact?	could I be retroacting? could you be retroacting? could she 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 she 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 she 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
couldn't I retroact? couldn't you retroact? couldn't she retroact? couldn't we retroact? couldn't you retroact? couldn't they retroact?	couldn't I be retroacting? couldn't you be retroacting? couldn't she be retroacting? couldn't we be retroacting? couldn't you be retroacting? couldn't they be retroacting?
Perfect	V-ing perfect
couldn't I have retroacted? couldn't you have retroacted? couldn't she have retroacted? couldn't we have retroacted? couldn't you have retroacted? couldn't they have retroacted?	couldn't I have been retroacting? couldn't you have been retroacting? couldn't she have been retroacting? couldn't we have been retroacting? couldn't you have been retroacting? couldn't they have been retroacting?