English verb conjugation COULD BLACKEN

Regular verb: blacken - blackened - blackened

Affirmation

Simple form

I could blacken
you could blacken
he could blacken
we could blacken
you could blacken
they could blacken

V-ing form

I could be blackening
you could be blackening
he could be blackening
we could be blackening
you could be blackening
they could be blackening

Perfect

I could have blackened
you could have blackened
he could have blackened
we could have blackened
you could have blackened
they could have blackened

V-ing perfect

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

Negation

Simple form

I couldn't blacken
you couldn't blacken
he couldn't blacken
we couldn't blacken
you couldn't blacken
they couldn't blacken

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I blacken?
could you blacken?
could he blacken?
could we blacken?
could you blacken?
could they blacken?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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