English verb conjugation
CAN BRIGHTEN

Regular verb: brighten - brightened - brightened

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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