English verb conjugation
MUST BRIGHTEN

Regular verb: brighten - brightened - brightened

Affirmation

Simple form	V-ing form
I must brighten you must brighten he must brighten we must brighten you must brighten they must brighten	I must be brightening you must be brightening he must be brightening we must be brightening you must be brightening they must be brightening
Perfect	V-ing perfect
I must have brightened you must have brightened he must have brightened we must have brightened you must have brightened they must have brightened	I must have been brightening you must have been brightening he must have been brightening we must have been brightening you must have been brightening they must have been brightening

Negation

Simple form	V-ing form
I mustn't brighten you mustn't brighten he mustn't brighten we mustn't brighten you mustn't brighten they mustn't brighten	I mustn't be brightening you mustn't be brightening he mustn't be brightening we mustn't be brightening you mustn't be brightening they mustn't be brightening
Perfect	V-ing perfect
I mustn't have brightened you mustn't have brightened he mustn't have brightened we mustn't have brightened you mustn't have brightened they mustn't have brightened	I mustn't have been brightening you mustn't have been brightening he mustn't have been brightening we mustn't have been brightening you mustn't have been brightening they mustn't have been brightening

Interrogative form

Simple form	V-ing form
must I brighten? must you brighten? must he brighten? must we brighten? must you brighten? must they brighten?	must I be brightening? must you be brightening? must he be brightening? must we be brightening? must you be brightening? must they be brightening?
Perfect	V-ing perfect
must I have brightened? must you have brightened? must he have brightened? must we have brightened? must you have brightened? must they have brightened?	must I have been brightening? must you have been brightening? must he have been brightening? must we have been brightening? must you have been brightening? must they have been brightening?

Interro-negative form

Simple form	V-ing form
mustn't I brighten? mustn't you brighten? mustn't he brighten? mustn't we brighten? mustn't you brighten? mustn't they brighten?	mustn't I be brightening? mustn't you be brightening? mustn't he be brightening? mustn't we be brightening? mustn't you be brightening? mustn't they be brightening?
Perfect	V-ing perfect
mustn't I have brightened? mustn't you have brightened? mustn't he have brightened? mustn't we have brightened? mustn't you have brightened? mustn't they have brightened?	mustn't I have been brightening? mustn't you have been brightening? mustn't he have been brightening? mustn't we have been brightening? mustn't you have been brightening? mustn't they have been brightening?