must pump
Verbo regular: pump - pumped- pumped

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must pump
you must pump
he must pump
we must pump
you must pump
they must pump 	I must be pumping
you must be pumping
he must be pumping
we must be pumping
you must be pumping
they must be pumping	I must have pumped
you must have pumped
he must have pumped
we must have pumped
you must have pumped
they must have pumped	I must have been pumping
you must have been pumping
he must have been pumping
we must have been pumping
you must have been pumping
they must have been pumping	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not pump
you must not pump
he must not pump
we must not pump
you must not pump
they must not pump 	I must not be pumping
you must not be pumping
he must not be pumping
we must not be pumping
you must not be pumping
they must not be pumping	I must not have pumped
you must not have pumped
he must not have pumped
we must not have pumped
you must not have pumped
they must not have pumped	I must not have been pumping
you must not have been pumping
he must not have been pumping
we must not have been pumping
you must not have been pumping
they must not have been pumping	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I pump?
must you pump?
must he pump?
must we pump?
must you pump?
must they pump? 	must I be pumping?
must you be pumping?
must he be pumping?
must we be pumping?
must you be pumping?
must they be pumping? 	must I have pumped?
must you have pumped?
must he have pumped?
must we have pumped?
must you have pumped?
must they have pumped? 	must I have been pumping?
must you have been pumping?
must he have been pumping?
must we have been pumping?
must you have been pumping?
must they have been pumping? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not pump?
must you not pump?
must he not pump?
must we not pump?
must you not pump?
must they not pump? 	must I not be pumping?
must you not be pumping?
must he not be pumping?
must we not be pumping?
must you not be pumping?
must they not be pumping? 	must I not have pumped?
must you not have pumped?
must he not have pumped?
must we not have pumped?
must you not have pumped?
must they not have pumped? 	must I not have been pumping?
must you not have been pumping?
must he not have been pumping?
must we not have been pumping?
must you not have been pumping?
must they not have been pumping?