B1 Gerunds & Infinitives 12 min read 보통

할 것을 잊다 vs. 한 것을 잊다

기억과 할 일 표현에 정확성을 더하는 forgot to do와 forgot doing의 차이를 마스터해서 더 자연스러운 영어를 구사해 보세요!
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Grammar Rule in 30 Seconds

Use 'to' for tasks you missed and '-ing' for memories you lost.

  • Forgot to do: You didn't do the task. Example: 'I forgot to call him.'
  • Forgot doing: You did it, but don't remember. Example: 'I forgot calling him.'
  • Negative focus: 'Never forget doing' is common for vivid memories.
🧠 + Forget + 📝 (to do) vs. 🧠 + Forget + 🎞️ (doing)

Overview

방에 들어갔는데 내가 여기 왜 왔는지 완전히 까먹은 적 있나요? 아니면 가스레인지를 켜두고 온 걸 깨닫고 심장이 덜컥 내려앉은 적은요? 우리 모두 무언가를 잊어버리곤 하죠.
하지만 영어에서는 잊어버린 것에 대해 어떻게 말하느냐에 따라, 해야 할 일을 놓친 건지 아니면 소중한 추억을 잃어버린 건지가 결정돼요. to do와 doing 사이의 이 작은 차이가 여러분의 이야기 전체를 바꿔놓는답니다. 잘못 사용하면 친구들이 여러분을 그냥 좀 덤벙거리는 게 아니라 기억상실증에 걸린 걸로 오해할 수도 있어요.
우유 사는 걸 잊어버린 것(forgetting to buy milk)과 우유를 이미 샀다는 사실 자체를 잊어버린 것(그래서 냉장고에 우유가 6팩이나 있게 되는 상황!)의 차이랄까요? 자, 이제 이 정신없는 머릿속을 정리해 봐요.
영어 동사들은 좀 까다로워요. 어떤 동사는 동명사(-ing)를 좋아하고, 어떤 동사는 부정사(to)를 좋아하죠. 그리고 forget 같은 동사는 아주 '드라마 퀸' 같아요.
뒤에 무엇이 오느냐에 따라 의미가 완전히 달라지거든요. 이 규칙은 여러분의 뇌 속에 있는 타임라인에 관한 거예요. forget 뒤에 부정사를 쓰면, 일어나지 않은 의무나 할 일에 대해 말하는 거예요.
동사의 할 일 목록(to-do list) 버전이라고 보면 돼요. 반면 동명사와 함께 쓰면, 분명히 일어났던 기억이나 경험에 대해 말하는 건데, 그 이미지가 희미해지거나 혹은 영원히 남는 경우를 뜻해요. 보통 동명사 버전은 "I'll never forget..."처럼 부정문으로 자주 쓰여요.
왜냐하면 실제로 그 경험을 잊어버렸다면 아예 그 얘기를 꺼내지도 못할 테니까요, 그쵸? 여러분이 크리스토퍼 놀란 감독의 영화 주인공이 아닌 이상, 보통 잊지 않았다고 말하는 것들은 기억하고 있기 마련이죠.

How This Grammar Works

비결은 바로 동작 타임라인(Action Timeline)이에요. 비디오 게임 퀘스트라고 생각해 보세요. 퀘스트가 일지에 아직 활성화되어 있는데 완료하지 못했다면, 그건 부정사(to)예요.
잊어버린 시점을 기준으로 동작이 미래에 있는 거죠. 해야 할 의무를 잊은 거예요. 자, 이제 이미 본 컷신을 떠올려 보세요.
그게 바로 동명사(-ing)예요. 동작은 과거에 일어났고, 여러분은 이제 머릿속에 저장된 녹화본을 되돌아보는 중인 거죠. 만약
I forgot to meet him
이라고 하면, 여러분은 집에 있었고 그 친구는 아마 화난 이모티콘을 보내고 있을 거예요.
하지만
I forgot meeting him
이라고 하면, 실제로 같이 앉아서 커피도 마시고 한 시간 동안 수다도 떨었는데, 그 사건 자체를 기억 저장소에서 완전히 지워버린 거예요. 전자는 여러분을 좀 건망증 있는 사람으로 만들지만, 후자는 좀 냉정한 사람처럼 보이게 할 수도 있어요! 대부분의 사람들은 일상적인 잡일에는 부정사를, 인생의 큰 순간들에는 동명사를 사용한답니다.

Formation Pattern

1
이 문장들을 만드는 건 3단계 과정이에요. 여러분이 «할 일 스킵러»인지 아니면 «기억 상실러»인지만 결정하면 돼요.
2
주어를 정하고 forget 동사를 알맞은 시제로 쓰세요. forget, forgot, 또는 will never forget 등을 쓸 수 있겠죠.
3
놓친 할 일의 경우: to + 동사원형을 더하세요. (예: I forgot to post the TikTok).
4
희미해진 기억의 경우: 동사 + -ing를 더하세요. (예: I'll never forget posting my first TikTok).

Conjugation Table

Form Example Vibe
--- --- ---
Infinitive (Task) I forgot to lock the door. 지금 문이 활짝 열려 있어요. 어이쿠.
Gerund (Memory) I forgot locking the door. 문을 잠그긴 했는데, 잠갔던 기억이 전혀 없어요.
Future Task Don't forget to call me! 미래의 나를 위한 리마인더예요.
Never + Gerund I'll never forget traveling to Tokyo. 그 여행은 정말 최고였고, 도쿄의 불빛이 아직도 눈에 선해요.

When To Use It

책임감에 대해 이야기할 때는 forget + to를 사용하세요. 이건 '어른 노릇(adulting)'을 할 때 필요한 문법이에요. 알림이나 놓친 마감 기한, 혹은 버스에 우산을 두고 내렸다는 걸 깨달은 순간에 사용하죠.
줌(Zoom) 회의에서
죄송해요, 마이크 음소거 해제하는 걸 깜빡했어요!(I forgot to unmute myself!)
라고 말할 때 딱이에요. (완전 요즘 스타일이죠?). 경험에 대해 말할 때는 forget + -ing를 사용하세요.
감성적인 이야기를 할 때 거의 항상 never와 짝을 이뤄 쓰여요. "이비자에서 그 일몰을 본 걸 절대 잊지 못할 거야(I'll never forget seeing that sunset in Ibiza)"라고 하면 멋진 인스타그램 캡션이 되겠죠. 또한 실제로 무언가를 하긴 했는데 뇌가 파일을 저장하지 않았을 때도 쓸 수 있어요.
파티에서 누군가 «우리 작년에 만났잖아요!»라고 하는데 전혀 모르겠다면, "정말 죄송해요, 당신을 만났던 걸 완전히 잊고 있었어요!(I'm so sorry, I totally forgot meeting you!)"라고 말할 수 있어요. 기억의 공백을 인정하는 예의 바른(혹은 어색한) 방법이죠.

Common Mistakes

큰 실수 중 하나는 동명사가 훨씬 자연스러운데도 that을 사용하는 거예요.
I forgot that I met him
대신
I forgot meeting him
이라고 해보세요. 데이터베이스를 읽는 로봇이 아니라 훨씬 더 자연스럽게 들린답니다. 또 다른 함정은 할 일에 동명사를 쓰는 거예요. 만약
I forgot calling my mom
이라고 하면, 엄마한테 전화를 하긴 했는데 그걸 기억 못 한다는 뜻이 돼요. 엄마는 전화를 받으셨으니 여전히 기뻐하시겠지만요. 하지만 전화를 아예 안 했다는 뜻이라면, 반드시 I forgot to call my mom이라고 해야 해요. 여기서 잘못 쓰면 아주 혼란스러운 가족 저녁 식사 자리가 될 수도 있답니다. 그리고 시제도 조심하세요! 많은 분들이 forget이 불규칙 동사(forget, forgot, forgotten)라는 걸 잊곤 해요. I have forgetted라고 말하면 영어 선생님이 울어버릴지도 몰라요. 깔끔하게 I forgot이나 I have forgotten이라고 하세요.

Contrast With Similar Patterns

이 규칙은 remember, regret, stop과 같은 동네에 살고 있어요. 모두 같은 논리를 따르거든요. remember to는 미래의 할 일이고, remember -ing는 과거의 기억이에요.
forget의 거울 이미지 같죠. regret to tell you는 곧 전할 나쁜 소식(격식 있는 줌 미팅 느낌)에 쓰이고, regret telling you는 이미 비밀을 다 털어놓고 나서 후회할 때 써요. stop to smoke는 담배를 피우기 위해 걷던 걸 멈춘 것이고, stop smoking은 드디어 담배를 끊었다는 뜻이에요.
to는 아직 도착하지 않은 목적지라고 생각하고, -ing는 이미 지나온 길이라고 생각하세요. forget만 마스터하면 다른 동사들의 치트키도 다 얻은 거나 다름없어요. 결국 «동작이냐 기억이냐»의 차이랍니다.

Quick FAQ

Q

I forgot that I had to...
라고 말해도 되나요?

가능해요. 하지만 문자나 일상 대화에서는 I forgot to...가 훨씬 더 임팩트 있고 흔하게 쓰여요.

Q

I forgot meeting him
은 항상 부정적인 의미인가요?

보통은 그래요. 기억을 잃어버렸다는 걸 나타낼 때 쓰거든요. 만약 기억이 난다면 remember를 썼겠죠.

Q

이 문법이 will과 함께 쓰이나요?

당연하죠!

I will never forget visiting Paris
는 핵심 기억(core memory)을 표현하는 전형적인 방식이에요.

Q

음식에도 쓸 수 있나요?

물론이죠!

I forgot to eat lunch
(점심 먹는 걸 잊어서 배고파요) vs.
I forgot eating that burger
(너무 정신이 없어서 그 햄버거 먹은 기억이 안 나요).

Q

격식 있는 이메일에 써도 괜찮을까요?

파일 첨부를 잊었을 때처럼 할 일에는

I forgot to attach the file
처럼 부정사를 쓰세요. 동명사 버전은 은퇴하는 게 아닌 이상 비즈니스 이메일에는 보통 너무 개인적이거나 감성적일 수 있어요.

Conjugating 'Forget' with Complements

Tense Forget Form Infinitive (Task) Gerund (Memory)
Present Simple
forget / forgets
I forget to call.
I forget calling.
Past Simple
forgot
I forgot to call.
I forgot calling.
Present Perfect
have forgotten
I've forgotten to call.
I've forgotten calling.
Future
will forget
I'll forget to call.
I'll forget calling.
Negative Future
will never forget
I'll never forget to call.
I'll never forget calling.

Common Contractions

Full Form Contraction Example
I did not forget
I didn't forget
I didn't forget to pay.
I will not forget
I won't forget
I won't forget to write.
I have forgotten
I've forgotten
I've forgotten to ask.

Meanings

The verb 'forget' changes meaning depending on whether it is followed by an infinitive (to + verb) or a gerund (verb + -ing).

1

Failure to perform a task

Using the infinitive indicates that a person did not perform an action because they did not remember it at the necessary time.

“Don't forget to buy milk on your way home.”

“She forgot to tell me about the meeting.”

2

Loss of memory of a past event

Using the gerund indicates that an action was performed in the past, but the person has no mental record or recollection of it.

“I'll never forget meeting you for the first time.”

“He forgot lending me the money, so he asked for it again.”

3

Neglecting a duty (Formal)

In formal contexts, 'forget to' can imply a failure of responsibility rather than just a memory slip.

“The defendant forgot to mention his previous convictions.”

“The company forgot to update its privacy policy.”

Reference Table

Reference table for 할 것을 잊다 vs. 한 것을 잊다
구조 의미 예시
Forgot + to + verb
무언가를 할 작정이었지만 하지 못했어요.
I forgot to send the email.
Forgot + verb-ing
무언가를 했는데 했다는 사실을 기억하지 못해요.
I forgot sending the email.
목적
완료하지 못한 의도나 할 일을 표현할 때.
I forgot to buy milk.
목적
이미 완료된 행동에 대한 잊어버린 기억을 표현할 때.
I forgot seeing that movie.
행동 상태
행동이 일어나지 않았습니다.
He forgot to turn off the light.
행동 상태
행동이 일어났습니다.
He forgot turning off the light.
흔한 실수
행동이 완료되지 않았는데 '-ing'를 사용하는 경우.
❌ I forgot calling him (meaning I didn't call).
흔한 실수
행동이 완료되었는데 'to + verb'를 사용하는 경우.
❌ I forgot to call him (meaning I called but don't recall).

격식 수준 스펙트럼

격식체
I neglected to transmit the report.

I neglected to transmit the report. (Workplace communication)

중립
I forgot to send the report.

I forgot to send the report. (Workplace communication)

비격식체
I totally blanked on the report.

I totally blanked on the report. (Workplace communication)

속어
I straight up forgot the report, my bad.

I straight up forgot the report, my bad. (Workplace communication)

Forget: 할 일 vs. 완료된 일

FORGET

`To + Verb` (부정사)

  • 미완료된 할 일 Forgot to send email
  • 놓친 의무 Forgot to call mom
  • 미래 의도 Don't forget to buy milk

`Verb-ing` (동명사)

  • 잊어버린 기억 Forgot seeing film
  • 기억 상실 Forgot meeting him
  • 과거 행동 Forgot saying that

`Forget` 행동 비교

`Forgot to do`
행동이 일어나지 않음 I forgot to turn off the oven. (Oven is still on.)
미래 지향적 Don't forget to submit homework.
누락에 대한 사과 Sorry, I forgot to reply.
`Forgot doing`
행동은 일어났지만, 기억 상실 I forgot turning off the oven. (Oven is off, I just don't remember doing it.)
과거 지향적 I forgot meeting him last year.
놀라움/기억 상실 I forgot saying that!

'Forget to do' vs. 'Forgot doing' 결정하기

1

행동이 일어났나요?

YES
`Forgot + verb-ing` 사용 (잊어버린 행동의 기억)
NO
`Forgot + to + verb` 사용 (수행되지 않은 의도)
2

완료하지 못한 할 일인가요?

YES
`Forgot + to + verb` 사용
NO
당신이 했지만 지금은 기억할 수 없는 일인가요?
3

무언가를 하지 못한 것에 대해 사과해야 하나요?

YES
`Forgot + to + verb` 사용
NO
당신의 과거 행동에 놀랐나요?

일상생활 속 `Forget` 상황

📝

할 일 목록 실패

  • • Forgot to buy groceries
  • • Forgot to pay bill
  • • Forgot to call friend
  • • Forgot to close window
🧠

기억 상실

  • • Forgot seeing that movie
  • • Forgot meeting that person
  • • Forgot saying something silly
  • • Forgot visiting that place
🔔

흔한 알림

  • • Don't forget to lock door
  • • Remember to set alarm
  • • Never forget to be kind
무료 가입하고 전체 설명 읽기

수준별 예문

1

Don't forget to call me.

No te olvides de llamarme.

2

I forgot to do my homework.

Olvidé hacer mi tarea.

3

Please don't forget to close the door.

Por favor, no olvides cerrar la puerta.

4

He forgot to buy milk.

Él olvidó comprar leche.

1

I'll never forget meeting the president.

Nunca olvidaré conocer al presidente.

2

Did you forget to bring your passport?

¿Olvidaste traer tu pasaporte?

3

She forgot to send the email yesterday.

Ella olvidó enviar el correo ayer.

4

I forgot seeing that movie before.

Olvidé haber visto esa película antes.

1

I forgot to lock the car, so I had to go back.

Olvidé cerrar el coche, así que tuve que volver.

2

I completely forgot meeting him at the party last year.

Olvidé por completo haberlo conocido en la fiesta el año pasado.

3

Don't forget to check the weather before you leave.

No olvides revisar el clima antes de irte.

4

He forgot taking his medicine this morning.

Él olvidó que se tomó su medicina esta mañana.

1

I forgot to mention that the office will be closed on Friday.

Olvidé mencionar que la oficina estará cerrada el viernes.

2

I'll never forget walking across the stage at graduation.

Nunca olvidaré caminar por el escenario en la graduación.

3

Have you forgotten to sign the contract?

¿Has olvidado firmar el contrato?

4

She forgot telling me the secret, so she told me again.

Ella olvidó que me había contado el secreto, así que me lo contó de nuevo.

1

I forgot to include the citations in the first draft.

Olvidé incluir las citas en el primer borrador.

2

One never forgets being treated with such kindness.

Uno nunca olvida ser tratado con tanta amabilidad.

3

He had forgotten to set the alarm, which resulted in a chaotic morning.

Había olvidado poner la alarma, lo que resultó en una mañana caótica.

4

I forgot having promised to help him move house.

Olvidé haber prometido ayudarlo a mudarse.

1

The witness forgot to disclose his financial interest in the company.

El testigo olvidó revelar su interés financiero en la empresa.

2

I shall never forget standing atop the Himalayas, breathless and humbled.

Nunca olvidaré estar de pie en la cima del Himalaya, sin aliento y humilde.

3

To forget to act is one thing; to forget having acted is quite another.

Olvidar actuar es una cosa; olvidar haber actuado es otra muy distinta.

4

She forgot being reprimanded as a child for her curiosity.

Ella olvidó haber sido reprendida de niña por su curiosidad.

혼동하기 쉬운

Forgot to do vs. Forgot doing 대 Remember to vs Remember doing

Learners mix up the task/memory distinction just like with 'forget'.

Forgot to do vs. Forgot doing 대 Stop to vs Stop doing

This rule is different. 'Stop to' means you stop one action to start another. 'Stop doing' means you end an action.

Forgot to do vs. Forgot doing 대 Regret to vs Regret doing

Regret to is for giving bad news; Regret doing is for feeling sorry about the past.

자주 하는 실수

✗

I forgot call him.

✓

I forgot to call him.

You must use 'to' before the verb.
✗

Don't forget buy milk.

✓

Don't forget to buy milk.

Imperatives with forget need 'to'.
✗

I forgot my keys at home.

✓

I left my keys at home.

Use 'leave' for locations, 'forget' for the action of not bringing.
✗

I forgot to meeting him.

✓

I forgot meeting him.

Don't mix 'to' and '-ing'.
✗

I forgot to meeting her last year.

✓

I forgot meeting her last year.

For past memories, use the gerund.
✗

I'll never forget to see the ocean.

✓

I'll never forget seeing the ocean.

If you saw it, use '-ing'.
✗

Did you forget to locking the door?

✓

Did you forget to lock the door?

Questions about tasks use 'to + base'.
✗

I forgot sending the email, so I sent it again.

✓

I forgot to send the email, so I sent it now.

If you sent it again, you didn't forget 'sending' it (the memory), you forgot 'to send' it (the task).
✗

She forgot to having been there.

✓

She forgot having been there.

The perfect gerund doesn't need 'to'.
✗

I forgot to tell you that I already told you.

✓

I forgot telling you that.

Use the gerund to avoid redundancy when discussing the act of speaking.
✗

He forgot to be told.

✓

He forgot being told.

If he was told but doesn't remember, use the passive gerund.
✗

I forgot to mention to have seen him.

✓

I forgot to mention seeing him.

Nested gerunds/infinitives need careful handling.
✗

I forgot to do it yesterday (when I actually did it).

✓

I forgot doing it yesterday.

Misrepresenting the state of the task.

문장 패턴

I forgot to ___ because ___.

I'll never forget ___ing ___.

Did you forget to ___ or did you just forget ___ing it?

Having forgotten to ___, I had to ___.

Real World Usage

Texting a friend very common

Sorry, I forgot to reply!

Job Interview occasional

I'll never forget leading my first team project.

Customer Support common

Did you forget to include your order number?

Social Media Caption very common

Never forget chasing sunsets in Bali.

Doctor's Appointment occasional

I forgot taking the pill this morning, so I took another one.

Travel / Airport common

Don't forget to check your gate number.

무료 가입하고 모든 예문 보기
💡

의도와 기억

아직 못 한 '할 일' 목록에 있는 것은 forgot to do로, 과거에 경험했지만 기억나지 않는 것은 forgot doing으로 생각해 보세요.
I forgot to send the report
vs.
I forgot sending the report.
⚠️

결과의 차이

이 둘을 잘못 사용하면 오해를 불러일으킬 수 있어요! 만약 보고서를 안 보냈는데 'I forgot sending the report'라고 말하면, 상사는 보고서가 이미 전송된 것으로 오해할 거예요.
I forgot sending the report
when you meant
I forgot to send the report.
🎯

'Remember'와의 연관성

'forget'의 규칙은 'remember'에도 비슷하게 적용돼요. 'remember to do'는 어떤 행동을 하는 것을 기억해서 그 행동을 완료한다는 의미예요. 'remember doing'은 과거에 했던 일을 기억해낸다는 뜻이고요.
I remember to lock the door
vs.
I remember locking the door.
🌍

사과와 책임

많은 비즈니스 환경에서 'I forgot to do X'는 실수를 인정하고 곧바로 고치겠다는 뜻을 내포해요. 반면 'I forgot doing X'는 명확한 추가 설명이 없다면 책임을 회피하는 것처럼 들릴 수 있어요.
I forgot to do X
vs.
I forgot doing X.
💡

'To'에 집중

'to + 동사원형'의 'to'는 앞으로 해야 할 행동을 가리켜요. 아직 수행되지 않은 의도를 표현할 때 아주 유용한 시각적 단서가 되죠! "Don't forget to lock the door."

Smart Tips

Always use 'to'. You are apologizing for a task you didn't do.

I forgot sending the file. → I forgot to send the file.

Use 'never forget' + '-ing'. It sounds much more natural than 'I will always remember'.

I will always remember our wedding. → I'll never forget getting married to you.

Use the gerund in a question to ask about the memory itself.

Did you forget to lock the door? (Asking if they missed the task) → Do you forget locking the door? (Asking if they have no memory of doing it)

Use 'neglected to' instead of 'forgot to' to sound more professional and precise.

I forgot to include the attachment. → I neglected to include the attachment.

발음

/fərˈɡɒt tə/

Reduction of 'to'

In 'forget to', the 'to' is often reduced to a schwa /tə/.

/fərˈɡɒtɪŋ/

Linking 'forget' and '-ing'

When using the gerund, the final 't' of 'forget' or 'forgot' often links to the vowel of the next word.

Emphasis on 'never'

I will NEVER forget meeting her.

Conveys strong emotional significance.

암기하기

기억법

To is for 'To-Do'; Ing is for 'In the past'.

시각적 연상

Imagine a 'To-Do' list with an empty checkbox for 'Forget to'. Imagine a photo album for 'Forget doing'.

Rhyme

If there's a task you didn't do, use the word that starts with TO. If it's a memory from the spring, use the word that ends in ING.

Story

John had a busy day. He forgot TO buy a ring (so he had no gift). Later, he forgot BUYING the ring (he found it in his pocket and was surprised).

Word Web

TaskMemoryInfinitiveGerundRecallNeglectOmission

챌린지

Write down three things you forgot to do yesterday, and one amazing thing you will never forget doing in your life.

문화 노트

British speakers often use 'forgotten' as the past participle, but in casual speech, 'forgot' is sometimes heard. 'I've forgot to do it' is common in some dialects but considered non-standard.

American English strictly uses 'forgotten' as the past participle. 'I've forgotten to...' is the standard way to express a recent missed task.

In corporate settings, saying 'I forgot to...' is seen as taking responsibility. Saying 'I forgot doing...' can sound like you are disorganized or have a poor memory for your own actions.

The word 'forget' comes from Old English 'forgytan', meaning 'to lose grip on' or 'to let go'.

대화 시작하기

“

What is one thing you always forget to do in the morning?

“

Tell me about a trip you will never forget taking.

“

Have you ever forgotten to bring something important to an exam or interview?

“

Do you ever forget doing something, like locking the door, and have to check twice?

일기 주제

Write about a time you forgot to do something important. What were the consequences?
Describe a childhood memory that you will never forget. Use vivid sensory details.
Compare the feeling of forgetting to do a task versus forgetting that you already did it.
Discuss the impact of technology on our memory. Do we forget to do things more often now?

자주 하는 실수

Incorrect

정답

Incorrect

정답

Incorrect

정답

Incorrect

정답

Sign up free to see all tips

Test Yourself

알맞은 형태를 고르세요.

Don't ___ your umbrella, it's going to rain later.

✓ Correct! ✗ Not quite. Correct answer: forget to take
우산을 가져가는 것은 앞으로 해야 할 행동이므로 'forget to take'가 맞아요. 우산을 '가지고 가는 것을 잊지 마세요'라는 의미죠.
올바른 문장을 고르세요. 객관식

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: I forgot to meet him for lunch, so he ate alone.
점심 약속을 잊어서 '그는 혼자 먹었다'는 결과가 나오죠. 이것은 약속이 지켜지지 않았다는 뜻이므로 'forgot to meet' (수행되지 않은 의도)가 올바른 형태입니다.
오류를 찾아 고치세요. Error Correction

Find and fix the mistake:

She completely forgot to watch that movie, even though she saw it last week.

✓ Correct! ✗ Not quite. Correct answer: She completely forgot watching that movie, even though she saw it last week.
'그녀는 지난주에 그 영화를 봤다'고 했으니, 영화를 본 행동은 '이미 일어난' 일이에요. 'forgot to watch'는 할 일을 잊은 경우에 쓰므로, 본 영화를 기억 못 하는 경우에는 'forgot watching' (잊어버린 과거의 기억)이 맞아요.
올바른 영어 문장을 입력하세요. 번역

Translate into English: 'Olvidé cerrar la puerta con llave.'

Answer starts with: ["I...

✓ Correct! ✗ Not quite. Correct answer: ["I forgot to lock the door."]
스페인어 문장은 문을 잠그는 행동이 수행되지 않았음을 암시하므로, 완료되지 않은 의도를 나타내는 'forgot to lock'을 사용합니다.

Score: /4

연습 문제

8 exercises
Fill in the blank with the correct form of the verb in parentheses.

I forgot ___ (buy) a gift for the party, so I had to stop at the store.

✓ Correct! ✗ Not quite. Correct answer: to buy
The person missed the task of buying a gift, so the infinitive 'to buy' is required.
Choose the sentence that means the action actually happened. 객관식

Which sentence implies the person has a memory of the event?

✓ Correct! ✗ Not quite. Correct answer: I forgot meeting him.
The gerund 'meeting' indicates a past experience that the person no longer remembers.
Correct the error in the following sentence. Error Correction

Find and fix the mistake:

I'll never forget to see the Eiffel Tower for the first time.

✓ Correct! ✗ Not quite. Correct answer: I'll never forget seeing
Vivid life memories use the gerund form.
Rewrite the sentence using 'forget'. Sentence Transformation

I didn't remember to lock the door.

✓ Correct! ✗ Not quite. Correct answer: I forgot to lock the door.
Not remembering to do a task is the same as forgetting to do it.
Is the following statement true or false? True False Rule

'I forgot to pay the bill' means the bill is still unpaid.

✓ Correct! ✗ Not quite. Correct answer: True
'Forget to' means the action was not completed.
Complete the dialogue. Dialogue Completion

A: Why are you late? B: Sorry, I forgot ___ (set) my alarm.

✓ Correct! ✗ Not quite. Correct answer: to set
Setting the alarm was a task that was missed.
Which form matches 'A memory of the past'? Grammar Sorting

✓ Correct! ✗ Not quite. Correct answer: Forget + doing
The gerund is used for recollections.
Match the sentence to its meaning. Match Pairs

1. I forgot to call. 2. I forgot calling.

✓ Correct! ✗ Not quite. Correct answer: 1-No call made, 2-Call made but forgotten
This highlights the core distinction between the two forms.

Score: /8

Practice Bank

12 exercises
알맞은 형태를 고르세요. 빈칸 채우기

Don't ___ your umbrella, it's going to rain later.

✓ Correct! ✗ Not quite. Correct answer: forget to take
올바른 문장을 고르세요. 객관식

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: He forgot to turn off the lights, and now the room is dark.
오류를 찾아 고치세요. Error Correction

I must have forgotten to download that game because I just found it in my downloads folder.

✓ Correct! ✗ Not quite. Correct answer: I must have forgotten downloading that game because I just found it in my downloads folder.
올바른 영어 문장을 입력하세요. 번역

Translate into English: 'Olvidé enviar el correo electrónico.'

✓ Correct! ✗ Not quite. Correct answer: ["I forgot to send the email.","I forgot to send the e-mail."]
단어를 배열하여 문장을 만드세요. Sentence Reorder

Arrange these words into a sentence:

✓ Correct! ✗ Not quite. Correct answer: He forgot telling me about the party.
각 문구를 올바른 의미와 연결하세요. Match Pairs

Match the phrases with the correct meaning:

✓ Correct! ✗ Not quite. Correct answer: matched
알맞은 형태를 고르세요. 빈칸 채우기

I always ___ my phone at home, it's so frustrating!

✓ Correct! ✗ Not quite. Correct answer: forget to take
올바른 문장을 고르세요. 객관식

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: She completely forgot seeing that movie, so she watched it again.
오류를 찾아 고치세요. Error Correction

I'm so sorry, I totally forgot taking out the trash today.

✓ Correct! ✗ Not quite. Correct answer: I'm so sorry, I totally forgot to take out the trash today.
올바른 영어 문장을 입력하세요. 번역

Translate into English: '¿Olvidaste apagar las luces?'

✓ Correct! ✗ Not quite. Correct answer: ["Did you forget to turn off the lights?"]
단어를 배열하여 문장을 만드세요. Sentence Reorder

Arrange these words into a sentence:

✓ Correct! ✗ Not quite. Correct answer: He forgot admitting his mistake.
오류를 찾아 고치세요. Error Correction

I can't believe I forgot to visit London last summer, even though I have photos!

✓ Correct! ✗ Not quite. Correct answer: I can't believe I forgot visiting London last summer, even though I have photos!

Score: /12

자주 묻는 질문 (8)

Yes, 'forget about' is usually followed by a noun or a gerund. 'I forgot about the meeting' or 'I forgot about calling him.' It often means you stopped thinking about it.

It is less common than 'forgot to'. Most people use it with 'never' for big memories. In other cases, they might say 'I don't remember doing that' instead.

'Forgot' is for a specific time in the past. 'Have forgotten' is used when the forgetting still affects the present (e.g., 'I've forgotten my password').

This is very rare and usually grammatically incorrect. Stick to 'I forgot doing' for past actions.

Yes! 'Remember to do' is for tasks, and 'Remember doing' is for memories. They are perfect mirrors of each other.

For tasks: 'I didn't forget to...'. For memories: 'I'll never forget...ing'.

'Forgot' is the past tense. 'Forgotten' is the past participle used with 'have' or in the passive voice.

This is common in casual speech, but technically you should use 'left' when you mention a place. 'I left my keys at home' is better.

Scaffolded Practice

1

1

2

2

3

3

4

4

Mastery Progress

Needs Practice

Improving

Strong

Mastered

무료 가입하고 연습하기

In Other Languages

Spanish moderate

Olvidar + infinitivo / Olvidar que...

Spanish lacks a direct gerund equivalent for memories.

French high

Oublier de + infinitif / Oublier d'avoir + participe passé

French uses the infinitive for both, just in different tenses.

German moderate

Vergessen zu + Infinitiv / Vergessen, dass...

German does not use the gerund (-ing) form at all.

Japanese high

〜するのを忘れる / 〜したのを忘れる

Japanese changes the tense of the internal verb (present vs past).

Arabic moderate

Nasiya an + subjunctive / Nasiya annahu + past

Arabic uses clause structures rather than simple verb endings.

Chinese low

忘记 (Wàngjì) + Verb

Chinese relies on aspect markers rather than infinitive/gerund distinctions.

Learning Path

Prerequisites

Previous
Remember + 동명사 vs 부정사
Next
Stop + 동명사 vs. 부정사: 그만두기 vs. 잠시 멈추기

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GERUND (-ing) or INFINITIVE (to) - When & How to Use them! (+ Free PDF & Quiz) 14:07 YouTube

GERUND (-ing) or INFINITIVE (to) - When & How to Use them! (+ Free PDF & Quiz)

English with Lucy
GERUND (ing) or INFINITIVE (to) – Everything You Need to Know! 18:11 YouTube

GERUND (ing) or INFINITIVE (to) – Everything You Need to Know!

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🔥 EXPLAINED! When to use the Infinitive and Gerund After Verbs 10:14 YouTube

🔥 EXPLAINED! When to use the Infinitive and Gerund After Verbs

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