English verb conjugation COULD DARKEN

Regular verb: darken - darkened - darkened

Affirmation

Simple form

I could darken
you could darken
she could darken
we could darken
you could darken
they could darken

V-ing form

I could be darkening
you could be darkening
she could be darkening
we could be darkening
you could be darkening
they could be darkening

Perfect

I could have darkened
you could have darkened
she 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
she 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
she 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
she 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
she 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
she 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 she darken?
could we darken?
could you darken?
could they darken?

V-ing form

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

Perfect

could I have darkened?
could you have darkened?
could she 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 she 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 she 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 she 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 she 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 she 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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