undo: verb conjugation and noun forms

Conjugation of the verb undo[ˈʌnˈdu:], irregular     

undo not undoundo?
All forms Indicative Conditional Participles Infinitives

Indicative

Present Indefinite

I undo
you undo
he/she/it undoes
we undo
you undo
they undo

Present Continuous

I am undoing
you are undoing
he/she/it is undoing
we are undoing
you are undoing
they are undoing

Present Perfect

I have undone
you have undone
he/she/it has undone
we have undone
you have undone
they have undone

Present Perfect Continuous

I have been undoing
you have been undoing
he/she/it has been undoing
we have been undoing
you have been undoing
they have been undoing

Past Indefinite

I undid
you undid
he/she/it undid
we undid
you undid
they undid

Past Continuous

I was undoing
you were undoing
he/she/it was undoing
we were undoing
you were undoing
they were undoing

Past Perfect

I had undone
you had undone
he/she/it had undone
we had undone
you had undone
they had undone

Past Perfect Continuous

I had been undoing
you had been undoing
he/she/it had been undoing
we had been undoing
you had been undoing
they had been undoing

Future Indefinite

I will undo
you will undo
he/she/it will undo
we will undo
you will undo
they will undo

Future Continuous

I will be undoing
you will be undoing
he/she/it will be undoing
we will be undoing
you will be undoing
they will be undoing

Future Perfect

I will have undone
you will have undone
he/she/it will have undone
we will have undone
you will have undone
they will have undone

Future Perfect Continuous

I will have been undoing
you will have been undoing
he/she/it will have been undoing
we will have been undoing
you will have been undoing
they will have been undoing

Indicative

Present Indefinite

I don't undo
you don't undo
he/she/it doesn't undo
we don't undo
you don't undo
they don't undo

Present Continuous

I am not undoing
you aren't undoing
he/she/it isn't undoing
we aren't undoing
you aren't undoing
they aren't undoing

Present Perfect

I haven't undone
you haven't undone
he/she/it hasn't undone
we haven't undone
you haven't undone
they haven't undone

Present Perfect Continuous

I haven't been undoing
you haven't been undoing
he/she/it hasn't been undoing
we haven't been undoing
you haven't been undoing
they haven't been undoing

Past Indefinite

I didn't undo
you didn't undo
he/she/it didn't undo
we didn't undo
you didn't undo
they didn't undo

Past Continuous

I wasn't undoing
you weren't undoing
he/she/it wasn't undoing
we weren't undoing
you weren't undoing
they weren't undoing

Past Perfect

I hadn't undone
you hadn't undone
he/she/it hadn't undone
we hadn't undone
you hadn't undone
they hadn't undone

Past Perfect Continuous

I hadn't been undoing
you hadn't been undoing
he/she/it hadn't been undoing
we hadn't been undoing
you hadn't been undoing
they hadn't been undoing

Future Indefinite

I shan't / won't undo
you won't undo
he/she/it won't undo
we shan't / won't undo
you won't undo
they won't undo

Future Continuous

I shan't / won't be undoing
you won't be undoing
he/she/it won't be undoing
we shan't / won't be undoing
you won't be undoing
they won't be undoing

Future Perfect

I shan't / won't have undone
you won't have undone
he/she/it won't have undone
we shan't / won't have undone
you won't have undone
they won't have undone

Future Perfect Continuous

I shan't / won't have been undoing
you won't have been undoing
he/she/it won't have been undoing
we shan't / won't have been undoing
you won't have been undoing
they won't have been undoing

Indicative

Present Indefinite

do I undo?
do you undo?
does he/she/it undo?
do we undo?
do you undo?
do they undo?

Present Continuous

am I undoing?
are you undoing?
is he/she/it undoing?
are we undoing?
are you undoing?
are they undoing?

Present Perfect

have I undone?
have you undone?
has he/she/it undone?
have we undone?
have you undone?
have they undone?

Present Perfect Continuous

have I been undoing?
have you been undoing?
has he/she/it been undoing?
have we been undoing?
have you been undoing?
have they been undoing?

Past Indefinite

did I undo?
did you undo?
did he/she/it undo?
did we undo?
did you undo?
did they undo?

Past Continuous

was I undoing?
were you undoing?
was he/she/it undoing?
were we undoing?
were you undoing?
were they undoing?

Past Perfect

had I undone?
had you undone?
had he/she/it undone?
had we undone?
had you undone?
had they undone?

Past Perfect Continuous

had I been undoing?
had you been undoing?
had he/she/it been undoing?
had we been undoing?
had you been undoing?
had they been undoing?

Future Indefinite

will I undo?
will you undo?
will he/she/it undo?
will we undo?
will you undo?
will they undo?

Future Continuous

will I be undoing?
will you be undoing?
will he/she/it be undoing?
will we be undoing?
will you be undoing?
will they be undoing?

Future Perfect

will I have undone?
will you have undone?
will he/she/it have undone?
will we have undone?
will you have undone?
will they have undone?

Future Perfect Continuous

will I have been undoing?
will you have been undoing?
will he/she/it have been undoing?
will we have been undoing?
will you have been undoing?
will they have been undoing?

Conditional

Conditional Present

I would undo
you would undo
he/she/it would undo
we would undo
you would undo
they would undo

Conditional Present Continuous

I would be undoing
you would be undoing
he/she/it would be undoing
we would be undoing
you would be undoing
they would be undoing

Conditional Perfect

I would have undone
you would have undone
he/she/it would have undone
we would have undone
you would have undone
they would have undone

Conditional Perfect Continuous

I would have been undoing
you would have been undoing
he/she/it would have been undoing
we would have been undoing
you would have been undoing
they would have been undoing

Conditional

Conditional Present

I wouldn't undo
you wouldn't undo
he/she/it wouldn't undo
we wouldn't undo
you wouldn't undo
they wouldn't undo

Conditional Present Continuous

I wouldn't be undoing
you wouldn't be undoing
he/she/it wouldn't be undoing
we wouldn't be undoing
you wouldn't be undoing
they wouldn't be undoing

Conditional Perfect

I wouldn't have undone
you wouldn't have undone
he/she/it wouldn't have undone
we wouldn't have undone
you wouldn't have undone
they wouldn't have undone

Conditional Perfect Continuous

I wouldn't have been undoing
you wouldn't have been undoing
he/she/it wouldn't have been undoing
we wouldn't have been undoing
you wouldn't have been undoing
they wouldn't have been undoing

Conditional

Conditional Present

would I undo?
would you undo?
would he/she/it undo?
would we undo?
would you undo?
would they undo?

Conditional Present Continuous

would I be undoing?
would you be undoing?
would he/she/it be undoing?
would we be undoing?
would you be undoing?
would they be undoing?

Conditional Perfect

would I have undone?
would you have undone?
would he/she/it have undone?
would we have undone?
would you have undone?
would they have undone?

Conditional Perfect Continuous

would I have been undoing?
would you have been undoing?
would he/she/it have been undoing?
would we have been undoing?
would you have been undoing?
would they have been undoing?

Participles

Present

undoing

Past

undone

Infinitives

Infinitives

to undo
to have undone
to be undoing
to have been undoing

Singular and plural for undo[ˈʌnˈdu:]     

Singular
Plural
Singular
Common case
undo
undoes
Possessive case
undo's / undo'
undoes'
Plural
undoes
undoes'
Did you find any mistake or inaccuracy? Please write to us.

English Verb Conjugation Online

PROMT.One helps you quickly check English verb forms online. Enter a verb and instantly get a table with the base form, the 3rd person singular form, the Past Simple form, the Past Participle form, and the -ing form, as well as conjugation across all 12 tenses with examples.

What the Table Shows

The service displays English verb forms by person, number, and tense, including regular, irregular, and phrasal verbs. This is useful for studying, translation, writing, and quick grammar checks.

How to Use It

  • Enter an English verb in the search box.
  • Click Search.
  • Get a table of forms, tenses, and usage examples.

Frequently Asked Questions

Which forms does the service show?
The base form, the 3rd person singular form, the Past Simple form, the Past Participle form, and the -ing form.

Does the service show irregular verbs?
Yes. PROMT.One shows irregular English verb forms and their usage across tenses.

Can I check a phrasal verb?
Yes. The service supports phrasal verbs and shows their forms together with examples.

Try it now: enter an English verb and get a complete table of forms and tenses in PROMT.One.

PROMT.One is a fast and helpful tool for any language learner. Check the conjugation of verbs and see the table of tenses for English, German, Russian, French, Italian, Portuguese and Spanish.