should brighten
Regular verb: brighten - brightened- brightened

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not brighten
you should not brighten
he should not brighten
we should not brighten
you should not brighten
they should not brighten 	I should not be brightening
you should not be brightening
he should not be brightening
we should not be brightening
you should not be brightening
they should not be brightening	I should not have brightened
you should not have brightened
he should not have brightened
we should not have brightened
you should not have brightened
they should not have brightened	I should not have been brightening
you should not have been brightening
he should not have been brightening
we should not have been brightening
you should not have been brightening
they should not have been brightening	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not brighten?
should you not brighten?
should he not brighten?
should we not brighten?
should you not brighten?
should they not brighten? 	should I not be brightening?
should you not be brightening?
should he not be brightening?
should we not be brightening?
should you not be brightening?
should they not be brightening? 	should I not have brightened?
should you not have brightened?
should he not have brightened?
should we not have brightened?
should you not have brightened?
should they not have brightened? 	should I not have been brightening?
should you not have been brightening?
should he not have been brightening?
should we not have been brightening?
should you not have been brightening?
should they not have been brightening?