English verb conjugation COULD DARKEN

Regular verb: darken - darkened - darkened

Affirmation

Simple form

I could darken
you could darken
he could darken
we could darken
you could darken
they could darken

V-ing form

I could be darkening
you could be darkening
he could be darkening
we could be darkening
you could be darkening
they could be darkening

Perfect

I could have darkened
you could have darkened
he could have darkened
we could have darkened
you could have darkened
they could have darkened

V-ing perfect

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

Negation

Simple form

I could not darken
you could not darken
he could not darken
we could not darken
you could not darken
they could not darken

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I darken?
could you darken?
could he darken?
could we darken?
could you darken?
could they darken?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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