must stamp
Verbo regular: stamp - stamped- stamped

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must stamp
you must stamp
he must stamp
we must stamp
you must stamp
they must stamp 	I must be stamping
you must be stamping
he must be stamping
we must be stamping
you must be stamping
they must be stamping	I must have stamped
you must have stamped
he 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
he must have been stamping
we must have been stamping
you must have been stamping
they must have been stamping	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not stamp
you must not stamp
he must not stamp
we must not stamp
you must not stamp
they must not stamp 	I must not be stamping
you must not be stamping
he must not be stamping
we must not be stamping
you must not be stamping
they must not be stamping	I must not have stamped
you must not have stamped
he must not have stamped
we must not have stamped
you must not have stamped
they must not have stamped	I must not have been stamping
you must not have been stamping
he must not have been stamping
we must not have been stamping
you must not have been stamping
they must not have been stamping	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I stamp?
must you stamp?
must he stamp?
must we stamp?
must you stamp?
must they stamp? 	must I be stamping?
must you be stamping?
must he be stamping?
must we be stamping?
must you be stamping?
must they be stamping? 	must I have stamped?
must you have stamped?
must he 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 he have been stamping?
must we have been stamping?
must you have been stamping?
must they have been stamping? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not stamp?
must you not stamp?
must he not stamp?
must we not stamp?
must you not stamp?
must they not stamp? 	must I not be stamping?
must you not be stamping?
must he not be stamping?
must we not be stamping?
must you not be stamping?
must they not be stamping? 	must I not have stamped?
must you not have stamped?
must he not have stamped?
must we not have stamped?
must you not have stamped?
must they not have stamped? 	must I not have been stamping?
must you not have been stamping?
must he not have been stamping?
must we not have been stamping?
must you not have been stamping?
must they not have been stamping?