English verb conjugation
MUST REPLY

Regular verb: reply - replied - replied

Affirmation

Simple form	V-ing form
I must reply you must reply he must reply we must reply you must reply they must reply	I must be replying you must be replying he must be replying we must be replying you must be replying they must be replying
Perfect	V-ing perfect
I must have replied you must have replied he must have replied we must have replied you must have replied they must have replied	I must have been replying you must have been replying he must have been replying we must have been replying you must have been replying they must have been replying

Negation

Simple form	V-ing form
I must not reply you must not reply he must not reply we must not reply you must not reply they must not reply	I must not be replying you must not be replying he must not be replying we must not be replying you must not be replying they must not be replying
Perfect	V-ing perfect
I must not have replied you must not have replied he must not have replied we must not have replied you must not have replied they must not have replied	I must not have been replying you must not have been replying he must not have been replying we must not have been replying you must not have been replying they must not have been replying

Interrogative form

Simple form	V-ing form
must I reply? must you reply? must he reply? must we reply? must you reply? must they reply?	must I be replying? must you be replying? must he be replying? must we be replying? must you be replying? must they be replying?
Perfect	V-ing perfect
must I have replied? must you have replied? must he have replied? must we have replied? must you have replied? must they have replied?	must I have been replying? must you have been replying? must he have been replying? must we have been replying? must you have been replying? must they have been replying?

Interro-negative form

Simple form	V-ing form
must I not reply? must you not reply? must he not reply? must we not reply? must you not reply? must they not reply?	must I not be replying? must you not be replying? must he not be replying? must we not be replying? must you not be replying? must they not be replying?
Perfect	V-ing perfect
must I not have replied? must you not have replied? must he not have replied? must we not have replied? must you not have replied? must they not have replied?	must I not have been replying? must you not have been replying? must he not have been replying? must we not have been replying? must you not have been replying? must they not have been replying?