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 must not subtract you must not subtract she must not subtract we must not subtract you must not subtract they must not subtract	I must not be subtracting you must not be subtracting she must not be subtracting we must not be subtracting you must not be subtracting they must not be subtracting
Perfect	V-ing perfect
I must not have subtracted you must not have subtracted she must not have subtracted we must not have subtracted you must not have subtracted they must not have subtracted	I must not have been subtracting you must not have been subtracting she must not have been subtracting we must not have been subtracting you must not have been subtracting they must not 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
must I not subtract? must you not subtract? must she not subtract? must we not subtract? must you not subtract? must they not subtract?	must I not be subtracting? must you not be subtracting? must she not be subtracting? must we not be subtracting? must you not be subtracting? must they not be subtracting?
Perfect	V-ing perfect
must I not have subtracted? must you not have subtracted? must she not have subtracted? must we not have subtracted? must you not have subtracted? must they not have subtracted?	must I not have been subtracting? must you not have been subtracting? must she not have been subtracting? must we not have been subtracting? must you not have been subtracting? must they not have been subtracting?