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 mustn't pump
you mustn't pump
he mustn't pump
we mustn't pump
you mustn't pump
they mustn't pump 	I mustn't be pumping
you mustn't be pumping
he mustn't be pumping
we mustn't be pumping
you mustn't be pumping
they mustn't be pumping	I mustn't have pumped
you mustn't have pumped
he mustn't have pumped
we mustn't have pumped
you mustn't have pumped
they mustn't have pumped	I mustn't have been pumping
you mustn't have been pumping
he mustn't have been pumping
we mustn't have been pumping
you mustn't have been pumping
they mustn't 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 	
mustn't I pump?
mustn't you pump?
mustn't he pump?
mustn't we pump?
mustn't you pump?
mustn't they pump? 	mustn't I be pumping?
mustn't you be pumping?
mustn't he be pumping?
mustn't we be pumping?
mustn't you be pumping?
mustn't they be pumping? 	mustn't I have pumped?
mustn't you have pumped?
mustn't he have pumped?
mustn't we have pumped?
mustn't you have pumped?
mustn't they have pumped? 	mustn't I have been pumping?
mustn't you have been pumping?
mustn't he have been pumping?
mustn't we have been pumping?
mustn't you have been pumping?
mustn't they have been pumping?