English verb conjugation COULD UNDO

Irregular verb: undo - undid - undone

Affirmation

Simple form

I could undo
you could undo
he could undo
we could undo
you could undo
they could undo

V-ing form

I could be undoing
you could be undoing
he could be undoing
we could be undoing
you could be undoing
they could be undoing

Perfect

I could have undone
you could have undone
he could have undone
we could have undone
you could have undone
they could have undone

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I undo?
could you undo?
could he undo?
could we undo?
could you undo?
could they undo?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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