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 may not quadruple
you may not quadruple
he may not quadruple
we may not quadruple
you may not quadruple
they may not quadruple 	I may not be quadrupling
you may not be quadrupling
he may not be quadrupling
we may not be quadrupling
you may not be quadrupling
they may not be quadrupling	I may not have quadrupled
you may not have quadrupled
he may not have quadrupled
we may not have quadrupled
you may not have quadrupled
they may not have quadrupled	I may not have been quadrupling
you may not have been quadrupling
he may not have been quadrupling
we may not have been quadrupling
you may not have been quadrupling
they may not 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 	
may I not quadruple?
may you not quadruple?
may he not quadruple?
may we not quadruple?
may you not quadruple?
may they not quadruple? 	may I not be quadrupling?
may you not be quadrupling?
may he not be quadrupling?
may we not be quadrupling?
may you not be quadrupling?
may they not be quadrupling? 	may I not have quadrupled?
may you not have quadrupled?
may he not have quadrupled?
may we not have quadrupled?
may you not have quadrupled?
may they not have quadrupled? 	may I not have been quadrupling?
may you not have been quadrupling?
may he not have been quadrupling?
may we not have been quadrupling?
may you not have been quadrupling?
may they not have been quadrupling?