English verb conjugation
MUST RETROACT

Regular verb: retroact - retroacted - retroacted

Affirmation

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

Negation

Simple form	V-ing form
I mustn't retroact you mustn't retroact he mustn't retroact we mustn't retroact you mustn't retroact they mustn't retroact	I mustn't be retroacting you mustn't be retroacting he mustn't be retroacting we mustn't be retroacting you mustn't be retroacting they mustn't be retroacting
Perfect	V-ing perfect
I mustn't have retroacted you mustn't have retroacted he mustn't have retroacted we mustn't have retroacted you mustn't have retroacted they mustn't have retroacted	I mustn't have been retroacting you mustn't have been retroacting he mustn't have been retroacting we mustn't have been retroacting you mustn't have been retroacting they mustn't have been retroacting

Interrogative form

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

Interro-negative form

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