은/는
topic particle
Meaning
은/는 marks what the sentence is about. It often frames the topic, and it can also set up a contrast with something else.
Form
After a consonant
은
이름 → 이름은
After a vowel
는
나 → 나는
Examples
저는 학생이에요.
I am a student.
오늘은 쉬어요.
Today, I'm resting.
커피는 마셔요. 술은 안 마셔요.
I drink coffee. I don't drink alcohol.
Watch out
Topic, not the same as subject
은/는 names the topic. 이/가 marks the grammatical subject. 저는 학생이에요 talks about me. 비가 와요 says the rain is what falls.