can downgrade
Regular verb: downgrade - downgraded- downgraded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can downgrade
you can downgrade
he can downgrade
we can downgrade
you can downgrade
they can downgrade 	I can be downgrading
you can be downgrading
he can be downgrading
we can be downgrading
you can be downgrading
they can be downgrading	I can have downgraded
you can have downgraded
he can have downgraded
we can have downgraded
you can have downgraded
they can have downgraded	I can have been downgrading
you can have been downgrading
he can have been downgrading
we can have been downgrading
you can have been downgrading
they can have been downgrading	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't downgrade
you can't downgrade
he can't downgrade
we can't downgrade
you can't downgrade
they can't downgrade 	I can't be downgrading
you can't be downgrading
he can't be downgrading
we can't be downgrading
you can't be downgrading
they can't be downgrading	I can't have downgraded
you can't have downgraded
he can't have downgraded
we can't have downgraded
you can't have downgraded
they can't have downgraded	I can't have been downgrading
you can't have been downgrading
he can't have been downgrading
we can't have been downgrading
you can't have been downgrading
they can't have been downgrading	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I downgrade?
can you downgrade?
can he downgrade?
can we downgrade?
can you downgrade?
can they downgrade? 	can I be downgrading?
can you be downgrading?
can he be downgrading?
can we be downgrading?
can you be downgrading?
can they be downgrading? 	can I have downgraded?
can you have downgraded?
can he have downgraded?
can we have downgraded?
can you have downgraded?
can they have downgraded? 	can I have been downgrading?
can you have been downgrading?
can he have been downgrading?
can we have been downgrading?
can you have been downgrading?
can they have been downgrading? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I downgrade?
can't you downgrade?
can't he downgrade?
can't we downgrade?
can't you downgrade?
can't they downgrade? 	can't I be downgrading?
can't you be downgrading?
can't he be downgrading?
can't we be downgrading?
can't you be downgrading?
can't they be downgrading? 	can't I have downgraded?
can't you have downgraded?
can't he have downgraded?
can't we have downgraded?
can't you have downgraded?
can't they have downgraded? 	can't I have been downgrading?
can't you have been downgrading?
can't he have been downgrading?
can't we have been downgrading?
can't you have been downgrading?
can't they have been downgrading?