이/가
subject particle
Meaning
이/가 marks the subject: who or what does the action, or what is being identified. It often brings new or focused information.
Form
After a consonant
이
이름 → 이름이
After a vowel
가
나 → 내가 · 저 + 가 → 제가
Examples
비가 와요.
It's raining.
제가 할게요.
I'll do it.
친구가 왔어요.
A friend came.
Watch out
저 + 가 becomes 제가
The subject particle after 저 is not 저가. It contracts to 제가. 나 + 가 is 내가.