English verb conjugation
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Regular verb: replace - replaced - replaced

Affirmation

Simple form	V-ing form
I must replace you must replace he must replace we must replace you must replace they must replace	I must be replacing you must be replacing he must be replacing we must be replacing you must be replacing they must be replacing
Perfect	V-ing perfect
I must have replaced you must have replaced he must have replaced we must have replaced you must have replaced they must have replaced	I must have been replacing you must have been replacing he must have been replacing we must have been replacing you must have been replacing they must have been replacing

Negation

Simple form	V-ing form
I must not replace you must not replace he must not replace we must not replace you must not replace they must not replace	I must not be replacing you must not be replacing he must not be replacing we must not be replacing you must not be replacing they must not be replacing
Perfect	V-ing perfect
I must not have replaced you must not have replaced he must not have replaced we must not have replaced you must not have replaced they must not have replaced	I must not have been replacing you must not have been replacing he must not have been replacing we must not have been replacing you must not have been replacing they must not have been replacing

Interrogative form

Simple form	V-ing form
must I replace? must you replace? must he replace? must we replace? must you replace? must they replace?	must I be replacing? must you be replacing? must he be replacing? must we be replacing? must you be replacing? must they be replacing?
Perfect	V-ing perfect
must I have replaced? must you have replaced? must he have replaced? must we have replaced? must you have replaced? must they have replaced?	must I have been replacing? must you have been replacing? must he have been replacing? must we have been replacing? must you have been replacing? must they have been replacing?

Interro-negative form

Simple form	V-ing form
must I not replace? must you not replace? must he not replace? must we not replace? must you not replace? must they not replace?	must I not be replacing? must you not be replacing? must he not be replacing? must we not be replacing? must you not be replacing? must they not be replacing?
Perfect	V-ing perfect
must I not have replaced? must you not have replaced? must he not have replaced? must we not have replaced? must you not have replaced? must they not have replaced?	must I not have been replacing? must you not have been replacing? must he not have been replacing? must we not have been replacing? must you not have been replacing? must they not have been replacing?