should quadruple
Regular verb: quadruple - quadrupled- quadrupled

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not quadruple
you should not quadruple
he should not quadruple
we should not quadruple
you should not quadruple
they should not quadruple 	I should not be quadrupling
you should not be quadrupling
he should not be quadrupling
we should not be quadrupling
you should not be quadrupling
they should not be quadrupling	I should not have quadrupled
you should not have quadrupled
he should not have quadrupled
we should not have quadrupled
you should not have quadrupled
they should not have quadrupled	I should not have been quadrupling
you should not have been quadrupling
he should not have been quadrupling
we should not have been quadrupling
you should not have been quadrupling
they should not 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 	
should I not quadruple?
should you not quadruple?
should he not quadruple?
should we not quadruple?
should you not quadruple?
should they not quadruple? 	should I not be quadrupling?
should you not be quadrupling?
should he not be quadrupling?
should we not be quadrupling?
should you not be quadrupling?
should they not be quadrupling? 	should I not have quadrupled?
should you not have quadrupled?
should he not have quadrupled?
should we not have quadrupled?
should you not have quadrupled?
should they not have quadrupled? 	should I not have been quadrupling?
should you not have been quadrupling?
should he not have been quadrupling?
should we not have been quadrupling?
should you not have been quadrupling?
should they not have been quadrupling?