A/V-겠어요 grammar = (1) I will, plan to; (2) I guess, sound, must be

A/V-겠다 grammar = (1) I will, plan to ~express intention to do something; (2) I guess, look like ~express a subjective supposition or guess

Usage 1 of A/V-겠다 = I will, plan to

- Express the speaker’s intention or will to do something, so the subject must be the 1st person = (I) will, be going to, plan to

다음 달에 토픽시험을 접수하겠어요.

I will apply for the TOPIK exam next month.

Usage 2 of A/V-겠다 = I guess, look, sound, must be

- Express a subjective supposition or guess about a certain situation or state with no reason or basis = I guess, look like, sound

이번 주말에 KPOP콘셔트에 보러 가요. 정말 재미있겠어요.

I'm going to see the KPOP concert this weekend. This must be really fun.

- In past tense, A/V + 았/었겠어요.

Tense

Adjective + 겠다 / 겠어요:

좋다 → 좋겠다 → 좋겠어요

예쁘다 → 예쁘겠다 → 예쁘겠어요

편하다 → 편하겠다 → 편하겠어요.

Verb + 겠다 / 겠어요:

가다 → 가겠다 → 가겠어요

보다 → 보겠다 → 보겠어요

되다 → 되겠다 → 되겠어요

일하다 → 일하겠다 → 일하겠어요

Noun +(이)겠다 / 겠어요:

밤 -> 밤이겠다 -> 밤이겠어요.

Examples:

*A/V-겠다 = (1) I will, plan to

1. This grammar is used to express speakers' intention or will to do something

이번 달에는 담배를 꼭 끊겠습니다.

This month, I am going to stop smoking.

다음 달에 제가 여행을 가겠습니다.

I will go on a trip in next month.

2. It can be used to convey information that something is about to occur = will, should

잠시 후에 인천공항에 도착하겠습니다.

We will soon arrive at Incheon airport.

내일 비가 오겠습니다.

It should rain tomorrow.

3. The negative form of -겠다 is -지 않겠어요 or 안 -겠어요.

이제 술을 마시지 않겠어요.

I won't drink alcohol anymore.

내일부터 늦게 일어나지 않겠어요.

I won't wake up late starting tomorrow.

4. This grammar is also used idiomatically

처음 뵙겠습니다.
It's pleasure to meet you. (Idiom)

잘 먹겠습니다.
Thank you for the food (Idiom)

엄마, 학교 다녀오겠습니다.
Mom, I am off to school.(Idiom)

5. This grammar can be used to express thought of speaker in a more gentle and polite way.

여러분, 여기까지 알겠어요?

- 아니요. 잘 모르겠어요.

Everyone, Do you understand so far?

- No, I don't quite understand.

*A/V-겠어요 = (2) I guess, look, sound, must be

1. 와, 맛있겠어요.
Wow, it looks delicious

2. 저 포스터를 보세요. 재미있겠어요.

Look at that poster. It sounds interesting.

3. 서울은 지금 밤이겠어요.

- 네. 여기는 지금 밤이에요.

It must be night in Seoul now. - Yes. It's night here now.

4. 요즘 퇴근하고 매일 영어를 배워요.

- 매일이요? 힘들겠어요.

These days, I study English everyday after getting off work

- Every day? It sounds tough.

5. 어제 일이 많아서 잠을 못 잤어요.

- 그래요? 피곤하겠어요.

I had a lot of work yesterday so that I couldn't sleep.

- Really? You must be tired.

6. 저는 한국에서 5년에 살았어요.

- 그럼 한국말을 잘하겠어요.

I’ve lived in Korea for 5 years.

- Then you seem to speak Korean well.

7. 이번 주에 제주도로 여행 갈 거예요.

- 와, 좋겠어요. 저도 가고 싶어요.

I am planning to take a trip to Jeju island this week.

- Wow, it sounds nice. I want to go too.