English verb conjugation
MUST SUBTRACT

Regular verb: subtract - subtracted - subtracted

Affirmation

Simple form	V-ing form
I must subtract you must subtract she must subtract we must subtract you must subtract they must subtract	I must be subtracting you must be subtracting she must be subtracting we must be subtracting you must be subtracting they must be subtracting
Perfect	V-ing perfect
I must have subtracted you must have subtracted she must have subtracted we must have subtracted you must have subtracted they must have subtracted	I must have been subtracting you must have been subtracting she must have been subtracting we must have been subtracting you must have been subtracting they must have been subtracting

Negation

Simple form	V-ing form
I mustn't subtract you mustn't subtract she mustn't subtract we mustn't subtract you mustn't subtract they mustn't subtract	I mustn't be subtracting you mustn't be subtracting she mustn't be subtracting we mustn't be subtracting you mustn't be subtracting they mustn't be subtracting
Perfect	V-ing perfect
I mustn't have subtracted you mustn't have subtracted she mustn't have subtracted we mustn't have subtracted you mustn't have subtracted they mustn't have subtracted	I mustn't have been subtracting you mustn't have been subtracting she mustn't have been subtracting we mustn't have been subtracting you mustn't have been subtracting they mustn't have been subtracting

Interrogative form

Simple form	V-ing form
must I subtract? must you subtract? must she subtract? must we subtract? must you subtract? must they subtract?	must I be subtracting? must you be subtracting? must she be subtracting? must we be subtracting? must you be subtracting? must they be subtracting?
Perfect	V-ing perfect
must I have subtracted? must you have subtracted? must she have subtracted? must we have subtracted? must you have subtracted? must they have subtracted?	must I have been subtracting? must you have been subtracting? must she have been subtracting? must we have been subtracting? must you have been subtracting? must they have been subtracting?

Interro-negative form

Simple form	V-ing form
mustn't I subtract? mustn't you subtract? mustn't she subtract? mustn't we subtract? mustn't you subtract? mustn't they subtract?	mustn't I be subtracting? mustn't you be subtracting? mustn't she be subtracting? mustn't we be subtracting? mustn't you be subtracting? mustn't they be subtracting?
Perfect	V-ing perfect
mustn't I have subtracted? mustn't you have subtracted? mustn't she have subtracted? mustn't we have subtracted? mustn't you have subtracted? mustn't they have subtracted?	mustn't I have been subtracting? mustn't you have been subtracting? mustn't she have been subtracting? mustn't we have been subtracting? mustn't you have been subtracting? mustn't they have been subtracting?