English verb conjugation
MUST SUBSTANTIATE

Regular verb: substantiate - substantiated - substantiated

Affirmation

Simple form	V-ing form
I must substantiate you must substantiate he must substantiate we must substantiate you must substantiate they must substantiate	I must be substantiating you must be substantiating he must be substantiating we must be substantiating you must be substantiating they must be substantiating
Perfect	V-ing perfect
I must have substantiated you must have substantiated he must have substantiated we must have substantiated you must have substantiated they must have substantiated	I must have been substantiating you must have been substantiating he must have been substantiating we must have been substantiating you must have been substantiating they must have been substantiating

Negation

Simple form	V-ing form
I mustn't substantiate you mustn't substantiate he mustn't substantiate we mustn't substantiate you mustn't substantiate they mustn't substantiate	I mustn't be substantiating you mustn't be substantiating he mustn't be substantiating we mustn't be substantiating you mustn't be substantiating they mustn't be substantiating
Perfect	V-ing perfect
I mustn't have substantiated you mustn't have substantiated he mustn't have substantiated we mustn't have substantiated you mustn't have substantiated they mustn't have substantiated	I mustn't have been substantiating you mustn't have been substantiating he mustn't have been substantiating we mustn't have been substantiating you mustn't have been substantiating they mustn't have been substantiating

Interrogative form

Simple form	V-ing form
must I substantiate? must you substantiate? must he substantiate? must we substantiate? must you substantiate? must they substantiate?	must I be substantiating? must you be substantiating? must he be substantiating? must we be substantiating? must you be substantiating? must they be substantiating?
Perfect	V-ing perfect
must I have substantiated? must you have substantiated? must he have substantiated? must we have substantiated? must you have substantiated? must they have substantiated?	must I have been substantiating? must you have been substantiating? must he have been substantiating? must we have been substantiating? must you have been substantiating? must they have been substantiating?

Interro-negative form

Simple form	V-ing form
mustn't I substantiate? mustn't you substantiate? mustn't he substantiate? mustn't we substantiate? mustn't you substantiate? mustn't they substantiate?	mustn't I be substantiating? mustn't you be substantiating? mustn't he be substantiating? mustn't we be substantiating? mustn't you be substantiating? mustn't they be substantiating?
Perfect	V-ing perfect
mustn't I have substantiated? mustn't you have substantiated? mustn't he have substantiated? mustn't we have substantiated? mustn't you have substantiated? mustn't they have substantiated?	mustn't I have been substantiating? mustn't you have been substantiating? mustn't he have been substantiating? mustn't we have been substantiating? mustn't you have been substantiating? mustn't they have been substantiating?