English verb conjugation
MUST STAMP

Regular verb: stamp - stamped - stamped

Affirmation

Simple form	V-ing form
I must stamp you must stamp she must stamp we must stamp you must stamp they must stamp	I must be stamping you must be stamping she must be stamping we must be stamping you must be stamping they must be stamping
Perfect	V-ing perfect
I must have stamped you must have stamped she must have stamped we must have stamped you must have stamped they must have stamped	I must have been stamping you must have been stamping she must have been stamping we must have been stamping you must have been stamping they must have been stamping

Negation

Simple form	V-ing form
I mustn't stamp you mustn't stamp she mustn't stamp we mustn't stamp you mustn't stamp they mustn't stamp	I mustn't be stamping you mustn't be stamping she mustn't be stamping we mustn't be stamping you mustn't be stamping they mustn't be stamping
Perfect	V-ing perfect
I mustn't have stamped you mustn't have stamped she mustn't have stamped we mustn't have stamped you mustn't have stamped they mustn't have stamped	I mustn't have been stamping you mustn't have been stamping she mustn't have been stamping we mustn't have been stamping you mustn't have been stamping they mustn't have been stamping

Interrogative form

Simple form	V-ing form
must I stamp? must you stamp? must she stamp? must we stamp? must you stamp? must they stamp?	must I be stamping? must you be stamping? must she be stamping? must we be stamping? must you be stamping? must they be stamping?
Perfect	V-ing perfect
must I have stamped? must you have stamped? must she have stamped? must we have stamped? must you have stamped? must they have stamped?	must I have been stamping? must you have been stamping? must she have been stamping? must we have been stamping? must you have been stamping? must they have been stamping?

Interro-negative form

Simple form	V-ing form
mustn't I stamp? mustn't you stamp? mustn't she stamp? mustn't we stamp? mustn't you stamp? mustn't they stamp?	mustn't I be stamping? mustn't you be stamping? mustn't she be stamping? mustn't we be stamping? mustn't you be stamping? mustn't they be stamping?
Perfect	V-ing perfect
mustn't I have stamped? mustn't you have stamped? mustn't she have stamped? mustn't we have stamped? mustn't you have stamped? mustn't they have stamped?	mustn't I have been stamping? mustn't you have been stamping? mustn't she have been stamping? mustn't we have been stamping? mustn't you have been stamping? mustn't they have been stamping?