English verb conjugation
CAN RETROACT

Regular verb: retroact - retroacted - retroacted

Affirmation

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

Negation

Simple form	V-ing form
I cannot retroact you cannot retroact she cannot retroact we cannot retroact you cannot retroact they cannot retroact	I cannot be retroacting you cannot be retroacting she cannot be retroacting we cannot be retroacting you cannot be retroacting they cannot be retroacting
Perfect	V-ing perfect
I cannot have retroacted you cannot have retroacted she cannot have retroacted we cannot have retroacted you cannot have retroacted they cannot have retroacted	I cannot have been retroacting you cannot have been retroacting she cannot have been retroacting we cannot have been retroacting you cannot have been retroacting they cannot have been retroacting

Interrogative form

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

Interro-negative form

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