[Grammar] -으니까 Because, reason

-(으)니까 Because~, therefore/so~

 

-(으)니까 means ‘because’ which expresses ‘reason’.  Let’s see the conjugation.

When a verb stem ends with a consonant + 으니까
When a verb stem ends with a vowel + 니까

For example,

날씨가 으니까 공원에 같이 가요.
The weather is nice, (so) let’s go to the park.
비가 니까 우산을 가져 가세요.
It is raining, (so) you should bring an umbrella.

  • In formal sentences, we often omit 까 and just say -(으)니.

It is often compared ‘-아/어/여서’(click here), the difference between ‘-아/어/여서’ and ‘-(으)니까’ is

1) -아/어/여서 can’t be used for suggesting, requesting or ordering, whereas -(으)니까 can.   For example,

  • 날씨가 좋아서 공원에 같이 가요. (X) => 날씨가 좋으니까 공원에 같이 가요. (O)
    같이 가요 => suggestion ; therefore you can’t use -아서
  • 비가 와서 우산을 가져 가세요. (X)  => 비가 오니까 우산을 가져 가세요. (O)
    -(으)세요 is an imperative verb ending; therefore you can’t use -아서
    • verb endings for suggesting are ‘-는 게 어때요?‘, -(으)ㄹ까요?, ‘-(으)ㅂ시다‘, ‘-자‘, ‘같이 -아/어/여요‘ etc and verb endings for requesting or ordering are  ‘-(으)세요‘, ‘-(으)십시오‘ etc.

 

2) You can’t use the past tense in front of -아/어/여서, while you can put the past tense in front of -(으)니까.  For example,

  • 어제 공부 많이 했어서 피곤해요. (X)    => 어제 공부 많이 해서 피곤해요. (O)
  • 어제 제가 이 영화를 봤으니까 오늘은 다른 영화를 봅시다. (O)

 

 

3) often used for general statements or emotion verbs=> -아/어/여서. For example,

  • 만나서 반갑습니다.  Glad to meet you! ( I am happy because I meet you.)
  • 도와 주셔서 감사합니다.  Thanks for your help! (I appreciate because you helped me.)
  • 늦어서 죄송합니다.  Sorry for being late. ( I am sorry because I am late.)
  • 배가 아파서 학교에 안 갔어요. ( I didn’t go to school because my stomach hurt.)

 

Sentences>>

여기 좀 시끄러우니까 다른 데로 가는 게 어때요?
It is loud here, how about going to another place?
민수 씨, 술을 많이 마셨으니까 운전 하지 마세요.
Minsu, You drank a lot, don’t drive!
여기는 도서관이니까 조용히 해야 돼요.
Because we are at the library, we should be quite.
제가 아직 집에 있으니까 조금만 기다려 주세요.
I am still at home, please wait for me a little bit more.
저도 아침을 안 먹었으니까 같이 밥 먹으러 가요.
I haven’t had breakfast yet, let’s go eat.
오늘은 제가 좀 피곤하니까 내일 갈까요?
I am a little bit tired today, can we go tomorrow?
이 우유는 상했으니까 먹지 마세요.
This milk has gone bad, don’t drink it!

You can listen to audio pronunciation on my Quizlet.com. (Click here) 

 If you want to learn more about -(으)니까, please click here.

[Grammar] -아/어/여서 ‘Because’, reasons

-아/어/여서 Because

 

-아/어/여서 means ‘because’ in English, it takes place after a verb or an adjective.  The conjugation is

1. When a verb/adjective stem ends with ‘아/오’ vowel  + 아서

i.e) – 비가 오(다) => 오(ㅗ vowel) +아서

– 잠을 못 자(다) => 자(ㅏ vowel) + 아서

2. When a verb/adjective stem ends with other vowels besides ‘아/오’ + 어서

– 밥을 안 먹(다) => 먹(ㅓ vowel) + 어서

– 술을 마시(다) => 마시(ㅣ vowel) + 어서

– 아직 안 배우(다) => 배우(ㅜ vowel) + 어서

3. When a verb or an adjective stem ends with ‘하’  + 여서 => 하여 =>

– 공부를 안 하(다) + 여서 => 공부를 안 해서

– 피곤하(다) + 여서 => 피곤해서

 

비가 와서 날씨가 시원해요.
Because it rains, it is cool.
어제 잠을 못 자서 피곤해요.
Because I didn’t sleep well yesterday, I am tired.
밥을 안 먹어서 배가 고파요.
Because I haven’t had a meal, I am hungry.
어제 술을 많이 마셔서 머리가 아파요.
Because I drank a lot yesterday, I have a headache.
아직 안 배워서 몰라요.
Because I haven’t learned yet, I don’t know.
공부를 안 해서 시험을 못 봤어요.
Because I didn’t study, I didn’t do well on my exam.
어제 피곤해서 잠을 많이 잤어요.
Because I was tired, I slept a lot.

You can listen to the pronunciation on my Quizlet.com (Click here).

 

As you can see on those sentences, you can’t add the tense in front of -아/어/여서 even though the event happened in the past.  If you want to express the tense, you can add the tense verb ending at the end of the sentence.

 

One more thing, you can’t use a suggestion sentence or an imperative sentence with -아/어/여서. For example,

 

Because the weather is nice, let’s go for a walk.  날씨가 좋아서 같이 산책해요.(X)
Because it rains, don’t go outside. 비가 와서 밖에 나가지 마세요.(X)
Because the tickets are sold out, can we see it tomorrow?  오늘 표가 없어서 내일 볼까요?(X)

 

If you want to use a suggestion or an imperative sentence, you should use -(으)니까.

Because the weather is nice, let’s go for a walk.  날씨가 좋으니까 같이 산책해요. (O)
Because it rains, don’t go outside. 비가 오니까 밖에 나가지 마세요.(O)
Because the tickets are sold out, can we see it tomorrow?   오늘 표가 없으니까 내일 볼까요?(O)

 

I will post more about -(으)니까 in the later post.