English verb conjugation
SHOULD RETROGRADE

Regular verb: retrograde - retrograded - retrograded

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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