English verb conjugation
CAN QUADRUPLE

Regular verb: quadruple - quadrupled - quadrupled

Affirmation

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

Negation

Simple form	V-ing form
I cannot quadruple you cannot quadruple he cannot quadruple we cannot quadruple you cannot quadruple they cannot quadruple	I cannot be quadrupling you cannot be quadrupling he cannot be quadrupling we cannot be quadrupling you cannot be quadrupling they cannot be quadrupling
Perfect	V-ing perfect
I cannot have quadrupled you cannot have quadrupled he cannot have quadrupled we cannot have quadrupled you cannot have quadrupled they cannot have quadrupled	I cannot have been quadrupling you cannot have been quadrupling he cannot have been quadrupling we cannot have been quadrupling you cannot have been quadrupling they cannot have been quadrupling

Interrogative form

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

Interro-negative form

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