may pump
Regular verb: pump - pumped- pumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may pump
you may pump
she may pump
we may pump
you may pump
they may pump 	I may be pumping
you may be pumping
she may be pumping
we may be pumping
you may be pumping
they may be pumping	I may have pumped
you may have pumped
she may have pumped
we may have pumped
you may have pumped
they may have pumped	I may have been pumping
you may have been pumping
she may have been pumping
we may have been pumping
you may have been pumping
they may have been pumping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't pump
you mayn't pump
she mayn't pump
we mayn't pump
you mayn't pump
they mayn't pump 	I mayn't be pumping
you mayn't be pumping
she mayn't be pumping
we mayn't be pumping
you mayn't be pumping
they mayn't be pumping	I mayn't have pumped
you mayn't have pumped
she mayn't have pumped
we mayn't have pumped
you mayn't have pumped
they mayn't have pumped	I mayn't have been pumping
you mayn't have been pumping
she mayn't have been pumping
we mayn't have been pumping
you mayn't have been pumping
they mayn't have been pumping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I pump?
may you pump?
may she pump?
may we pump?
may you pump?
may they pump? 	may I be pumping?
may you be pumping?
may she be pumping?
may we be pumping?
may you be pumping?
may they be pumping? 	may I have pumped?
may you have pumped?
may she have pumped?
may we have pumped?
may you have pumped?
may they have pumped? 	may I have been pumping?
may you have been pumping?
may she have been pumping?
may we have been pumping?
may you have been pumping?
may they have been pumping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I pump?
mayn't you pump?
mayn't she pump?
mayn't we pump?
mayn't you pump?
mayn't they pump? 	mayn't I be pumping?
mayn't you be pumping?
mayn't she be pumping?
mayn't we be pumping?
mayn't you be pumping?
mayn't they be pumping? 	mayn't I have pumped?
mayn't you have pumped?
mayn't she have pumped?
mayn't we have pumped?
mayn't you have pumped?
mayn't they have pumped? 	mayn't I have been pumping?
mayn't you have been pumping?
mayn't she have been pumping?
mayn't we have been pumping?
mayn't you have been pumping?
mayn't they have been pumping?