Скачать или смотреть the difference 되 vs 돼

돼 is contracted form of 되어

just remember only one Verb, "되다 become/ok/works"
Verb 되다 (O) : only verb
Verb 돼다 (X) : 돼다 does NOT exist

That means we are going to check only 2 things
1. we use only 되 
2. 
if the following syllable is 어 : 되어 = 돼
if the following syllable is NOT 어 : 되 nothing change


examples)
want to be a teacher
선생님이 되고 싶어요.
되 + 고

will be a hot summer
더운 여름이 될 거예요
되 + ㄹ

(1/2) it's ok to eat this but
이건 먹어도 되지만
되 + 지

have a good weekend
좋은 주말 되세요
되 + 세


ㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡ


I became a korean teacher
한국어 선생님이 됐어요
되 + 었어요 = 됐어요

It's hot. it's not ok to touch
뜨거워요. 만지면 안 돼요
되 + 어요 = 돼요

I'm glad to be a friends
친구가 돼서 기뻐요
되 + 어서 = 돼서

(2/2) it's ok to eat this but it's not ok to eat this.
이건 먹어도 되지만, 이건 먹으면 안 돼요.
되 + 지만 = 되지만 ---------- 되 + 어요 = 돼요