English verb conjugation
MUST POSTMARK

Regular verb: postmark - postmarked - postmarked

Affirmation

Simple form	V-ing form
I must postmark you must postmark he must postmark we must postmark you must postmark they must postmark	I must be postmarking you must be postmarking he must be postmarking we must be postmarking you must be postmarking they must be postmarking
Perfect	V-ing perfect
I must have postmarked you must have postmarked he must have postmarked we must have postmarked you must have postmarked they must have postmarked	I must have been postmarking you must have been postmarking he must have been postmarking we must have been postmarking you must have been postmarking they must have been postmarking

Negation

Simple form	V-ing form
I must not postmark you must not postmark he must not postmark we must not postmark you must not postmark they must not postmark	I must not be postmarking you must not be postmarking he must not be postmarking we must not be postmarking you must not be postmarking they must not be postmarking
Perfect	V-ing perfect
I must not have postmarked you must not have postmarked he must not have postmarked we must not have postmarked you must not have postmarked they must not have postmarked	I must not have been postmarking you must not have been postmarking he must not have been postmarking we must not have been postmarking you must not have been postmarking they must not have been postmarking

Interrogative form

Simple form	V-ing form
must I postmark? must you postmark? must he postmark? must we postmark? must you postmark? must they postmark?	must I be postmarking? must you be postmarking? must he be postmarking? must we be postmarking? must you be postmarking? must they be postmarking?
Perfect	V-ing perfect
must I have postmarked? must you have postmarked? must he have postmarked? must we have postmarked? must you have postmarked? must they have postmarked?	must I have been postmarking? must you have been postmarking? must he have been postmarking? must we have been postmarking? must you have been postmarking? must they have been postmarking?

Interro-negative form

Simple form	V-ing form
must I not postmark? must you not postmark? must he not postmark? must we not postmark? must you not postmark? must they not postmark?	must I not be postmarking? must you not be postmarking? must he not be postmarking? must we not be postmarking? must you not be postmarking? must they not be postmarking?
Perfect	V-ing perfect
must I not have postmarked? must you not have postmarked? must he not have postmarked? must we not have postmarked? must you not have postmarked? must they not have postmarked?	must I not have been postmarking? must you not have been postmarking? must he not have been postmarking? must we not have been postmarking? must you not have been postmarking? must they not have been postmarking?