English verb conjugation COULD BRIGHTEN

Regular verb: brighten - brightened - brightened

Affirmation

Simple form

I could brighten
you could brighten
he could brighten
we could brighten
you could brighten
they could brighten

V-ing form

I could be brightening
you could be brightening
he could be brightening
we could be brightening
you could be brightening
they could be brightening

Perfect

I could have brightened
you could have brightened
he could have brightened
we could have brightened
you could have brightened
they could have brightened

V-ing perfect

I could have been brightening
you could have been brightening
he could have been brightening
we could have been brightening
you could have been brightening
they could have been brightening

Negation

Simple form

I could not brighten
you could not brighten
he could not brighten
we could not brighten
you could not brighten
they could not brighten

V-ing form

I could not be brightening
you could not be brightening
he could not be brightening
we could not be brightening
you could not be brightening
they could not be brightening

Perfect

I could not have brightened
you could not have brightened
he could not have brightened
we could not have brightened
you could not have brightened
they could not have brightened

V-ing perfect

I could not have been brightening
you could not have been brightening
he could not have been brightening
we could not have been brightening
you could not have been brightening
they could not have been brightening

Interrogative form

Simple form

could I brighten?
could you brighten?
could he brighten?
could we brighten?
could you brighten?
could they brighten?

V-ing form

could I be brightening?
could you be brightening?
could he be brightening?
could we be brightening?
could you be brightening?
could they be brightening?

Perfect

could I have brightened?
could you have brightened?
could he have brightened?
could we have brightened?
could you have brightened?
could they have brightened?

V-ing perfect

could I have been brightening?
could you have been brightening?
could he have been brightening?
could we have been brightening?
could you have been brightening?
could they have been brightening?

Interro-negative form

Simple form

could I not brighten?
could you not brighten?
could he not brighten?
could we not brighten?
could you not brighten?
could they not brighten?

V-ing form

could I not be brightening?
could you not be brightening?
could he not be brightening?
could we not be brightening?
could you not be brightening?
could they not be brightening?

Perfect

could I not have brightened?
could you not have brightened?
could he not have brightened?
could we not have brightened?
could you not have brightened?
could they not have brightened?

V-ing perfect

could I not have been brightening?
could you not have been brightening?
could he not have been brightening?
could we not have been brightening?
could you not have been brightening?
could they not have been brightening?

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