Core Grammar Rule: -(으)로
The particle -(으)로 is attached to a noun to indicate that it is the tool, means, method, or instrument used to perform an action. It answers the question "How?" or "With what?".
Meaning & Usage
Meaning: It translates to "by," "with," "using," or "through" in English.
When to use: Use it to specify the mode of transportation (버스로 - by bus), a tool (펜으로 - with a pen), a language (한국어로 - in Korean), or a material (나무로 - with wood). It clarifies how an action is accomplished.
Conjugation Rules
Rule: The choice between -로 and -으로 depends on whether the preceding noun ends in a vowel/ㄹ or a consonant.
Vowel or ㄹ: Attach -로. (e.g. 버스 → 버스로 / 지하철 → 지하철로)
Consonant (except ㄹ): Attach -으로. (e.g. 펜 → 펜으로 / 인터넷 → 인터넷으로)
Vowel/ㄹ: + 로 / Consonant: + 으로
Common Combinations
-(으)로 frequently pairs with specific types of verbs, creating natural-sounding phrases that are essential for daily conversation.
Transportation + Verbs of Movement
Context: When talking about how you get from one place to another, -(으)로 is almost always followed by verbs like 가다 (to go), 오다 (to come), or 다니다 (to commute/attend).
Example: 회사에 지하철로 다녀요. (I commute to work by subway.) / 친구가 미국에서 비행기로 왔어요. (My friend came from the US by plane.)
Tools/Methods + Verbs of Action
Context: When describing how you perform a task, -(으)로 is paired with action verbs like 쓰다 (to write), 만들다 (to make), 말하다 (to speak), or 찾다 (to search).
Example: 이메일을 영어로 썼어요. (I wrote the email in English.) / 인터넷으로 맛집을 찾았어요. (I found a good restaurant online.)
[Transportation] + 로 + 가다/오다 / [Tool] + 으로 + 쓰다/만들다
Another Use of -(으)로: Direction
While this lesson focuses on -(으)로 for means or tools, it's also commonly used to indicate a direction. The meaning is usually clear from the context and the verb used.