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