should quadruple
Regular verb: quadruple - quadrupled- quadrupled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd quadruple
you'd quadruple
he'd quadruple
we'd quadruple
you'd quadruple
they'd quadruple 	I'd be quadrupling
you'd be quadrupling
he'd be quadrupling
we'd be quadrupling
you'd be quadrupling
they'd be quadrupling	I should've quadrupled
you should've quadrupled
he should've quadrupled
we should've quadrupled
you should've quadrupled
they should've quadrupled	I should've been quadrupling
you should've been quadrupling
he should've been quadrupling
we should've been quadrupling
you should've been quadrupling
they should've been quadrupling	

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

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

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