may quadruple
Regular verb: quadruple - quadrupled- quadrupled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may quadruple
you may quadruple
he may quadruple
we may quadruple
you may quadruple
they may quadruple 	I may be quadrupling
you may be quadrupling
he may be quadrupling
we may be quadrupling
you may be quadrupling
they may be quadrupling	I may have quadrupled
you may have quadrupled
he may have quadrupled
we may have quadrupled
you may have quadrupled
they may have quadrupled	I may have been quadrupling
you may have been quadrupling
he may have been quadrupling
we may have been quadrupling
you may have been quadrupling
they may have been quadrupling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't quadruple
you mayn't quadruple
he mayn't quadruple
we mayn't quadruple
you mayn't quadruple
they mayn't quadruple 	I mayn't be quadrupling
you mayn't be quadrupling
he mayn't be quadrupling
we mayn't be quadrupling
you mayn't be quadrupling
they mayn't be quadrupling	I mayn't have quadrupled
you mayn't have quadrupled
he mayn't have quadrupled
we mayn't have quadrupled
you mayn't have quadrupled
they mayn't have quadrupled	I mayn't have been quadrupling
you mayn't have been quadrupling
he mayn't have been quadrupling
we mayn't have been quadrupling
you mayn't have been quadrupling
they mayn't have been quadrupling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I quadruple?
may you quadruple?
may he quadruple?
may we quadruple?
may you quadruple?
may they quadruple? 	may I be quadrupling?
may you be quadrupling?
may he be quadrupling?
may we be quadrupling?
may you be quadrupling?
may they be quadrupling? 	may I have quadrupled?
may you have quadrupled?
may he have quadrupled?
may we have quadrupled?
may you have quadrupled?
may they have quadrupled? 	may I have been quadrupling?
may you have been quadrupling?
may he have been quadrupling?
may we have been quadrupling?
may you have been quadrupling?
may they have been quadrupling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I quadruple?
mayn't you quadruple?
mayn't he quadruple?
mayn't we quadruple?
mayn't you quadruple?
mayn't they quadruple? 	mayn't I be quadrupling?
mayn't you be quadrupling?
mayn't he be quadrupling?
mayn't we be quadrupling?
mayn't you be quadrupling?
mayn't they be quadrupling? 	mayn't I have quadrupled?
mayn't you have quadrupled?
mayn't he have quadrupled?
mayn't we have quadrupled?
mayn't you have quadrupled?
mayn't they have quadrupled? 	mayn't I have been quadrupling?
mayn't you have been quadrupling?
mayn't he have been quadrupling?
mayn't we have been quadrupling?
mayn't you have been quadrupling?
mayn't they have been quadrupling?