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 couldn't darken
you couldn't darken
he couldn't darken
we couldn't darken
you couldn't darken
they couldn't darken

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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