joheun saenggagieyo.

That’s a good idea.

Breakdown of joheun saenggagieyo.

• 이다: to be
• 좋다: good
• 생각: idea

Questions & Answers about joheun saenggagieyo.

Why is it 좋은 and not 좋다 or 좋아요?

좋은 is the form used when 좋다 comes before a noun and describes it.

• 좋다 = dictionary form, to be good
• 좋아요 = sentence-ending form, it is good
• 좋은 = noun-modifying form, good ...

Because 생각 is a noun, Korean uses 좋은 생각 for a good idea / a good thought.

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Why is it 좋은 and not 좋는?

This is because 좋다 is a descriptive verb, and descriptive verbs usually use -(으)ㄴ to modify a noun.

So:

• 좋다 → 좋은

It is not -는, which is more typical for action verbs in the present tense. So 좋는 생각 is incorrect.

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What does 생각 mean here?