may quintuple
Regular verb: quintuple - quintupled- quintupled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may quintuple
you may quintuple
she may quintuple
we may quintuple
you may quintuple
they may quintuple 	I may be quintupling
you may be quintupling
she may be quintupling
we may be quintupling
you may be quintupling
they may be quintupling	I may have quintupled
you may have quintupled
she may have quintupled
we may have quintupled
you may have quintupled
they may have quintupled	I may have been quintupling
you may have been quintupling
she may have been quintupling
we may have been quintupling
you may have been quintupling
they may have been quintupling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not quintuple
you may not quintuple
she may not quintuple
we may not quintuple
you may not quintuple
they may not quintuple 	I may not be quintupling
you may not be quintupling
she may not be quintupling
we may not be quintupling
you may not be quintupling
they may not be quintupling	I may not have quintupled
you may not have quintupled
she may not have quintupled
we may not have quintupled
you may not have quintupled
they may not have quintupled	I may not have been quintupling
you may not have been quintupling
she may not have been quintupling
we may not have been quintupling
you may not have been quintupling
they may not have been quintupling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I quintuple?
may you quintuple?
may she quintuple?
may we quintuple?
may you quintuple?
may they quintuple? 	may I be quintupling?
may you be quintupling?
may she be quintupling?
may we be quintupling?
may you be quintupling?
may they be quintupling? 	may I have quintupled?
may you have quintupled?
may she have quintupled?
may we have quintupled?
may you have quintupled?
may they have quintupled? 	may I have been quintupling?
may you have been quintupling?
may she have been quintupling?
may we have been quintupling?
may you have been quintupling?
may they have been quintupling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not quintuple?
may you not quintuple?
may she not quintuple?
may we not quintuple?
may you not quintuple?
may they not quintuple? 	may I not be quintupling?
may you not be quintupling?
may she not be quintupling?
may we not be quintupling?
may you not be quintupling?
may they not be quintupling? 	may I not have quintupled?
may you not have quintupled?
may she not have quintupled?
may we not have quintupled?
may you not have quintupled?
may they not have quintupled? 	may I not have been quintupling?
may you not have been quintupling?
may she not have been quintupling?
may we not have been quintupling?
may you not have been quintupling?
may they not have been quintupling?