English verb conjugation COULD UNDO

Irregular verb: undo - undid - undone

Affirmation

Simple form

I could undo
you could undo
she could undo
we could undo
you could undo
they could undo

V-ing form

I could be undoing
you could be undoing
she could be undoing
we could be undoing
you could be undoing
they could be undoing

Perfect

I could have undone
you could have undone
she 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
she 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
she 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
she 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
she 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
she 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 she undo?
could we undo?
could you undo?
could they undo?

V-ing form

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

Perfect

could I have undone?
could you have undone?
could she 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 she 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 she 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 she 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 she 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 she 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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