English verb conjugation
MUST DECUPLE

Regular verb: decuple - decupled - decupled

Affirmation

Simple form	V-ing form
I must decuple you must decuple she must decuple we must decuple you must decuple they must decuple	I must be decupling you must be decupling she must be decupling we must be decupling you must be decupling they must be decupling
Perfect	V-ing perfect
I must have decupled you must have decupled she must have decupled we must have decupled you must have decupled they must have decupled	I must have been decupling you must have been decupling she must have been decupling we must have been decupling you must have been decupling they must have been decupling

Negation

Simple form	V-ing form
I mustn't decuple you mustn't decuple she mustn't decuple we mustn't decuple you mustn't decuple they mustn't decuple	I mustn't be decupling you mustn't be decupling she mustn't be decupling we mustn't be decupling you mustn't be decupling they mustn't be decupling
Perfect	V-ing perfect
I mustn't have decupled you mustn't have decupled she mustn't have decupled we mustn't have decupled you mustn't have decupled they mustn't have decupled	I mustn't have been decupling you mustn't have been decupling she mustn't have been decupling we mustn't have been decupling you mustn't have been decupling they mustn't have been decupling

Interrogative form

Simple form	V-ing form
must I decuple? must you decuple? must she decuple? must we decuple? must you decuple? must they decuple?	must I be decupling? must you be decupling? must she be decupling? must we be decupling? must you be decupling? must they be decupling?
Perfect	V-ing perfect
must I have decupled? must you have decupled? must she have decupled? must we have decupled? must you have decupled? must they have decupled?	must I have been decupling? must you have been decupling? must she have been decupling? must we have been decupling? must you have been decupling? must they have been decupling?

Interro-negative form

Simple form	V-ing form
mustn't I decuple? mustn't you decuple? mustn't she decuple? mustn't we decuple? mustn't you decuple? mustn't they decuple?	mustn't I be decupling? mustn't you be decupling? mustn't she be decupling? mustn't we be decupling? mustn't you be decupling? mustn't they be decupling?
Perfect	V-ing perfect
mustn't I have decupled? mustn't you have decupled? mustn't she have decupled? mustn't we have decupled? mustn't you have decupled? mustn't they have decupled?	mustn't I have been decupling? mustn't you have been decupling? mustn't she have been decupling? mustn't we have been decupling? mustn't you have been decupling? mustn't they have been decupling?