Undo

défaire, annuler

Irregular verb.

Conjugated like do, overdo, redo, outdo

  • Like do

    This verb conjugates like do: undid, undone.

In speech, the helping verbs shorten: I’m, he’s, we’re, I’ve, I’ll, I’d.

Underlined: the stem is not the infinitive’s.

Newbie

Enough to talk about now, the past, and your plans, and to give instructions.

  1. Present simple

    Habits, facts, and how things usually are. To say no or ask, add do or does: I don't undo, he doesn't undo.

    1. I / you / we / they undo
    2. he / she / it undoes

  2. Present continuous

    What is happening now, and plans already arranged: we’re leaving tomorrow.

    1. I am undoing
    2. you / we / they are undoing
    3. he / she / it is undoing

  3. Past simple

    A finished action at a past time: yesterday, in 2020. To say no or ask, add did: I didn't undo.

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

  4. Future with going to

    Plans and intentions, and what you can see coming: it’s going to rain.

    1. I am going to undo
    2. you / we / they are going to undo
    3. he / she / it is going to undo

  5. Imperative

    Orders, advice, and instructions. Let’s suggests doing it together. To say no: don't undo.

    1. (you) undo
    2. let's undo
BeginnerExperiences, what you were doing, and the future with will.Present perfect · Past continuous · Future with willAlso show the Beginner tenses (3)

  1. Present perfect

    The past linked to now: experiences, news, and what started earlier and still goes on: I’ve lived here for two years.

    1. I / you / we / they have undone
    2. he / she / it has undone

  2. Past continuous

    An action in progress at a past moment, often interrupted: I was cooking when you called.

    1. I / he / she / it was undoing
    2. you / we / they were undoing

  3. Future with will

    Predictions, promises, offers, and decisions made now: I’ll help you.

    1. I / you / he / she / it / we / they will undo
IntermediateHow long something has lasted, the past before the past, and what would happen.Present perfect continuous · Past perfect · Future continuous · Conditional · Conditional perfectAlso show the Intermediate tenses (5)

  1. Present perfect continuous

    An activity from the past until now, and how long it has lasted: I’ve been waiting for an hour.

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

  2. Past perfect

    The past before another past moment: when I arrived, the train had left.

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

  3. Future continuous

    An action in progress at a future moment: this time tomorrow, I’ll be flying.

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

  4. Conditional

    What would happen in an imagined situation, and polite requests: if I had time, I would help.

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

  5. Conditional perfect

    What would have happened, but did not: if I had known, I would have come.

    1. I / you / he / she / it / we / they would have undone
AdvancedWhat will have happened, and the longer continuous tenses.Past perfect continuous · Future perfect · Future perfect continuous · Conditional continuous · Conditional perfect continuousAlso show the Advanced tenses (5)

  1. Past perfect continuous

    An activity that had been going on until a past moment: she was tired because she had been running.

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

  2. Future perfect

    An action finished before a future moment: by Friday, I’ll have finished.

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

  3. Future perfect continuous

    How long an activity will have lasted at a future moment: in June, I’ll have been working here for a year.

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

  4. Conditional continuous

    An action that would be in progress in an imagined situation: if I were rich, I would be traveling now.

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

  5. Conditional perfect continuous

    An activity that would have been going on in an imagined past: without the rain, we would have been playing outside.

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