English verb conjugation
CAN RETROGRADE

Regular verb: retrograde - retrograded - retrograded

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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