What is the past tense of "undertake"?

The past simple of "undertake" is "undertook". The organization undertakes to protect endangered wildlife.

What is a common mistake with "undertake"?

Wrong: "He undertakes the project yesterday.". Correct: "He undertook the project yesterday.". Past tense irregular: 'undertake' → 'undertook', not 'undertakes'.

Conjugation of "Undertake" — All Forms, Examples, and Usage

Q: Is "undertake" regular or irregular?

"Undertake" is an irregular English verb. Pattern: take.

Q: How do you pronounce "undertake"?

/ˌʌndərˈteɪk/ — Stress falls on the second syllable: un-der-TAKE, not UN-der-take.

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All 12 Tenses of "Undertake"

Quick reference table — every tense form of "undertake" with the first-person example and a link to the grammar guide for that tense.

Tense	Example (I)	Quick rule
Simple Present	`I undertake`	Used for habits, facts, routines, and permanent situations. Full rule →
Simple Past	`I undertaked`	Used for completed actions at a specific time in the past. Full rule →
Simple Future	`I will undertake`	Used for predictions, decisions made at the moment, and promises. Full rule →
Present Continuous	`I am undertaking`	Used for actions happening right now or temporary situations. Full rule →
Past Continuous	`I was undertaking`	Used for actions in progress at a specific moment in the past. Full rule →
Future Continuous	`I will be undertaking`	Used for actions that will be in progress at a specific future time. Full rule →
Present Perfect	`I have undertaked`	Used for past actions with present relevance, life experiences, or unfinished situations. Full rule →
Past Perfect	`I had undertaked`	Used for an action that was completed before another past action. Full rule →
Future Perfect	`I will have undertaked`	Used for an action that will be completed before a specific future time. Full rule →
Present Perfect Continuous	`I have been undertaking`	Used for actions that started in the past and continue now, with focus on duration. Full rule →
Past Perfect Continuous	`I had been undertaking`	Used for ongoing actions in the past that continued up to another past moment. Full rule →
Future Perfect Continuous	`I will have been undertaking`	Used for actions that will have been ongoing up until a specific future time. Full rule →

Past Tense of "Undertake" — Undertook

The past simple of "undertake" is "undertook". Use it for completed actions at a specific past time. Because "undertake" is irregular, "undertook" is not formed by adding -ed — you have to memorize this form. See our simple past tense guide for a deeper explanation of the simple past.

Past Participle of "Undertake" — Undertaken

The past participle of "undertake" is "undertaken". Use it after "have/has/had" for the perfect tenses ("I have undertaken"), and after "be" for passive constructions ("It was undertaken"). Because "undertake" is irregular, "undertaken" is not the same as the past simple — students often confuse the two forms.

Is "Undertake" Regular or Irregular?

"Undertake" is an irregular English verb. Its principal parts are: base form "undertake", past simple "undertook", and past participle "undertaken". The 3rd-person singular present is "undertakes" and the present participle/gerund is "undertaking". Conjugation pattern: take.

Conjugation pattern: take

How to Pronounce "Undertake" and Its Forms

Undertake: /ˌʌndərˈteɪk/ — Stress pattern: ooO

Stress falls on the second syllable: un-der-TAKE, not UN-der-take.

Common mispronunciation of "undertake"

Pronouncing with stress on first syllable: UN-der-take.

Syllable breakdown: un · der · take

How to Use "Undertake" — Common Grammar Patterns

Use undertake in formal contexts; avoid in casual speech where 'do' or 'take on' suffice.

undertake + noun
undertake to + verb

Example Sentences with "Undertake" in Different Tenses

Present Continuous: She is undertaking a major research project in biology. B2

Common Collocations with "Undertake"

undertake responsibility
undertake a project
undertake a mission

When to Use "Undertake" vs Similar Verbs

Smart synonyms — when to use each one

commit — For general dedication to a goal or task
pledge — When making a formal promise or vow
assume — For taking on responsibility more passively
begin — For starting an undertaking with specific plans

Common Mistakes with "Undertake"

Wrong: She undertake often.
Correct: She undertakes often.
Add "s" to the verb when the subject is third-person singular (he/she/it).

Origin and Etymology of "Undertake"

From Old English 'under' + 'take'; meaning evolved from physical action to commitment.

Other Forms of "Undertake"

Noun: undertaking

Conjugation Tables for "Undertake"

Negative Forms

Simple present: I do not undertake · He does not undertake
Simple past: I did not undertake · She did not undertake
Present perfect: I have not undertaken · He has not undertaken

Question Forms

Simple present: Do you undertake? · Does he undertake?
Simple past: Did you undertake?
Present perfect: Have you undertaken?

Passive Voice (where applicable)

Simple present passive: It is undertaken
Simple past passive: It was undertaken
Present perfect passive: It has been undertaken

Frequently Asked Questions About "Undertake"

Is "undertake" regular or irregular?: "undertake" is an irregular verb. Its past simple is "undertaked" and past participle is "undertaked". You must memorize these forms.
What is the past tense of "undertake"?: The simple past of "undertake" is "undertaked".
Are the past simple and past participle the same for "undertake"?: Yes, for this irregular verb, both the past simple and past participle are "undertaked".