English verb conjugation
MUST RETROGRADE

Regular verb: retrograde - retrograded - retrograded

Affirmation

Simple form	V-ing form
I must retrograde you must retrograde he must retrograde we must retrograde you must retrograde they must retrograde	I must be retrograding you must be retrograding he must be retrograding we must be retrograding you must be retrograding they must be retrograding
Perfect	V-ing perfect
I must have retrograded you must have retrograded he must have retrograded we must have retrograded you must have retrograded they must have retrograded	I must have been retrograding you must have been retrograding he must have been retrograding we must have been retrograding you must have been retrograding they must have been retrograding

Negation

Simple form	V-ing form
I must not retrograde you must not retrograde he must not retrograde we must not retrograde you must not retrograde they must not retrograde	I must not be retrograding you must not be retrograding he must not be retrograding we must not be retrograding you must not be retrograding they must not be retrograding
Perfect	V-ing perfect
I must not have retrograded you must not have retrograded he must not have retrograded we must not have retrograded you must not have retrograded they must not have retrograded	I must not have been retrograding you must not have been retrograding he must not have been retrograding we must not have been retrograding you must not have been retrograding they must not have been retrograding

Interrogative form

Simple form	V-ing form
must I retrograde? must you retrograde? must he retrograde? must we retrograde? must you retrograde? must they retrograde?	must I be retrograding? must you be retrograding? must he be retrograding? must we be retrograding? must you be retrograding? must they be retrograding?
Perfect	V-ing perfect
must I have retrograded? must you have retrograded? must he have retrograded? must we have retrograded? must you have retrograded? must they have retrograded?	must I have been retrograding? must you have been retrograding? must he have been retrograding? must we have been retrograding? must you have been retrograding? must they have been retrograding?

Interro-negative form

Simple form	V-ing form
must I not retrograde? must you not retrograde? must he not retrograde? must we not retrograde? must you not retrograde? must they not retrograde?	must I not be retrograding? must you not be retrograding? must he not be retrograding? must we not be retrograding? must you not be retrograding? must they not be retrograding?
Perfect	V-ing perfect
must I not have retrograded? must you not have retrograded? must he not have retrograded? must we not have retrograded? must you not have retrograded? must they not have retrograded?	must I not have been retrograding? must you not have been retrograding? must he not have been retrograding? must we not have been retrograding? must you not have been retrograding? must they not have been retrograding?