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 couldn't brighten
you couldn't brighten
he couldn't brighten
we couldn't brighten
you couldn't brighten
they couldn't brighten

V-ing form

I couldn't be brightening
you couldn't be brightening
he couldn't be brightening
we couldn't be brightening
you couldn't be brightening
they couldn't be brightening

Perfect

I couldn't have brightened
you couldn't have brightened
he couldn't have brightened
we couldn't have brightened
you couldn't have brightened
they couldn't have brightened

V-ing perfect

I couldn't have been brightening
you couldn't have been brightening
he couldn't have been brightening
we couldn't have been brightening
you couldn't have been brightening
they couldn't 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

couldn't I brighten?
couldn't you brighten?
couldn't he brighten?
couldn't we brighten?
couldn't you brighten?
couldn't they brighten?

V-ing form

couldn't I be brightening?
couldn't you be brightening?
couldn't he be brightening?
couldn't we be brightening?
couldn't you be brightening?
couldn't they be brightening?

Perfect

couldn't I have brightened?
couldn't you have brightened?
couldn't he have brightened?
couldn't we have brightened?
couldn't you have brightened?
couldn't they have brightened?

V-ing perfect

couldn't I have been brightening?
couldn't you have been brightening?
couldn't he have been brightening?
couldn't we have been brightening?
couldn't you have been brightening?
couldn't they have been brightening?

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