Grammar
-(으)면 되다
all you need to do is…
Form
Verb stem + -(으)면 되다: specifies a sufficient condition for the desired result.
Function
Presents a condition as sufficient: meeting it is enough or produces the desired outcome.
Why this form?
-아/어야 하다 — “must, have to”: expresses an obligation; -(으)면 되다 states what is enough without necessarily imposing a strict requirement.
How to build it
Stem ending in a vowel or ㄹ: -면 되다; other consonant: -으면 되다.
Forms not to confuse
-아/어야 하다
여기에 이름을 써야 해요. — You must write your name here.
Examples
그럼 또 기다리면 되겠네. — Then we can just wait some more.
여기에 이름을 쓰면 돼요. — You only need to write your name here.