-(아/어/여)야 되다 Obligatary Ending
August 22, 2009 by tailieutienghan
This grammatical construction expresses obligation in Korean. It is used with all verbs (both action and descriptive) to express what one must do or must be. This grammatical structure is often translated as “have to (verb),” “must (verb).”
The final verb 되다 (doeda) – usually means “become” but it can also mean: “work out smoothly,” “go without problem,” “be able to achieve.”
The final verb 되다 (doeda) can often be replaced with the verb 하다 (hada) as the final verb and still hold the same exact meaning.
The tense and politeness level is regularly expressed in the verb 되다 (doeda)/하다 (hada). Negation, however, is regularly expressed in the first verb.
Verb stem + (아/어/여)야 되다
Verb stem + (아/어/여)야 하다
아 (a) – is used with verbs stems with the final vowels ㅏ (a) or ㅗ (o)
어 (eo) – is used with verb stems with any other final vowels
여 (yeo0 – is used with 하다 (hada) verbs
준비하다 (junbihada) – to prepare
준비하 (junbiha) – verb stem
준비하 + (여)야 되다 – 여 (yeo) conjugation is used with 하다 (hada) verbs
준비해야 되다 (junbi haeya doeda) – to have to prepare
저는 준비해야 되겠어요. (jeo-neun junbi haeya doegesseoyo.) – I'll have to prepare. [Verb tense and politeness level was expressed in the final verb, 되다 (doeda)]
저는 준비 안 해야 되겠어요. (jeo-neun junbi an haeya doegesseoyo.) – I won't have to prepare. [Negation was expressed in the first verb, 준비하다 (junbihada)]
1.전화하지 마. 나 일해야 돼.
(junhwahaji ma. na il haeya dwae.)
Don't talk on the phone. I have to work.
2.시끄럽게 하지 마. 나 공부해야 돼.
(sikkeureopge hajima. na gongbuhaeya dwae.)
Don't be loud. I have to study.
3.무슨 일 생겨도, 이 전화를 받아야 해요!
(museun il saenggyeo-do, i jeonhwa-reul badaya haeyo!)
Whatever happens, you must answer this phone!
The final verb -되다 (-doeda) cannot inflect the past tense. Instead the past tense must be inflected using the verb 하다 (hada) – in place of 되다 (doeda).
-지 않으면 안 되다 (obligation)
-으면 안 되다 (negative obligation)
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