jungyohan bubune hyeonggwangpeneul sseumyeon najunge bokseuphagi swiwo.

If you use a highlighter on important parts, it’s easy to review later.

Breakdown of jungyohan bubune hyeonggwangpeneul sseumyeon najunge bokseuphagi swiwo.

• ~을: object particle
• ~에: location particle
• 쓰다: to use
• 쉽다: easy

Questions & Answers about jungyohan bubune hyeonggwangpeneul sseumyeon najunge bokseuphagi swiwo.

Why is it 중요한 부분 and not 중요하는 부분?

Because 중요하다 is a descriptive verb (an adjective-like verb in Korean), not an action verb.

When a descriptive verb modifies a noun in the present state, it usually takes -ㄴ/은:

• 중요하다 → 중요한 = important
• 예쁘다 → 예쁜 = pretty
• 크다 → 큰 = big

So:

• 중요한 부분 = an important part / important parts

By contrast, -는 is typically used with action verbs:

• 먹다 → 먹는 사람 = a person who eats
• 공부하다 → 공부하는 학생 = a student who studies

So 중요하는 is not correct here.

What does 부분에 mean, and why is 에 used?

부분 means part or section.

The particle 에 here marks the location/target where something is applied. In this sentence, it means something like:

• on the important parts
• to the important parts

So:

• 중요한 부분에 형광펜을 쓰면
  = if you use a highlighter on the important parts

This 에 is similar to the surface/location where the action happens.

Why is it 형광펜을 쓰면? Doesn’t 쓰다 mean to write?