I must pump you must pump he must pump we must pump you must pump they must pump
V-ing form
I must be pumping you must be pumping he must be pumping we must be pumping you must be pumping they must be pumping
Perfect
I must have pumped you must have pumped he must have pumped we must have pumped you must have pumped they must have pumped
V-ing perfect
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
Negation
Simple form
I mustn't pump you mustn't pump he mustn't pump we mustn't pump you mustn't pump they mustn't pump
V-ing form
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
Perfect
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
V-ing perfect
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
Interrogative form
Simple form
must I pump? must you pump? must he pump? must we pump? must you pump? must they pump?
V-ing form
must I be pumping? must you be pumping? must he be pumping? must we be pumping? must you be pumping? must they be pumping?
Perfect
must I have pumped? must you have pumped? must he have pumped? must we have pumped? must you have pumped? must they have pumped?
V-ing perfect
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?
Interro-negative form
Simple form
mustn't I pump? mustn't you pump? mustn't he pump? mustn't we pump? mustn't you pump? mustn't they pump?
V-ing form
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?
Perfect
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?
V-ing perfect
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?