Read the line before the blank

Both 저는 학생이에요 and 제가 학생이에요 can mean “I am a student.” Changing the particle does not create a new English dictionary meaning for “I.” It changes how the information fits the conversation.

This beginner lesson takes three small situations: introducing a topic, identifying who does something, and comparing two things. You need to read Hangul and recognise short polite sentences. If 학생이에요 is unfamiliar, start with 이에요 and 예요.

Do not try to solve every particle choice from a translation alone. First ask what the other person already said, what information is missing, and whether you are making a contrast. These questions give the grammar a job you can see.

Choose the pair, then choose its spelling

Within each pair, the final sound of the noun controls the form. 책 ends in ㄱ, so use 은 or 이. 커피 ends in a vowel, so use 는 or 가. Write the particle directly against the noun: 책은, not 책 은.

That spelling choice is separate from the meaning choice. Knowing that 커피 ends in a vowel tells you to choose 는 instead of 은, or 가 instead of 이. It does not tell you whether the conversation needs the topic pair or the subject pair.

Learn these useful pronoun forms as complete chunks: 저는 and 제가. 저 is the humble “I.” With the subject particle it becomes 제가, not 저가 in the standard form taught here. Likewise, 나 + 가 becomes 내가; 누구 + 가 becomes 누가.

Set up what you are talking about

Imagine that a new study partner asks you to introduce yourself. You can say 저는 한국어를 공부해요. The sentence presents you as the topic and says what you study. It does not automatically mean that nobody else studies Korean.

A topic is what you are setting up the sentence to talk about. A subject is a grammatical role within the sentence. These ideas often involve the same person in simple examples, but they are not identical labels.

“As for me” can help you notice the topic, but it is usually an awkward phrase to repeat in an English translation. Translate the natural message as “I study Korean.” Keep the topic explanation in your understanding of the situation.

Answer a question about who does it

Here the missing information is the person doing the action. 제가 and 민서 씨가 identify that person. The question has already supplied the action, so your answer fills the “who” slot.

This is a useful context for 이/가, not a claim that the particle always means “only.” 제가 운전해요 identifies you as the driver in this exchange. Whether other people will also drive depends on the wider conversation.

Compare the introduction above with this answer. The same person can use 저는 when setting up a topic and 제가 when identifying themselves as the answer. “Use 는 for people you know and 가 for strangers” would not explain that difference.

Put two things side by side

The paired topics make the comparison clear. 은/는 can mark contrast: we are saying one thing about the coffee and another about the water. The surrounding sentences show what is being contrasted.

You may also hear only one side stated. Someone could say 커피는 뜨거워요 while thinking of another drink. Without that context, you should not invent the missing comparison. Read the actual conversation, not a hidden story you have guessed.

Notice that 물 takes 은 and 가방 also takes 은. Both nouns end in a consonant. The fact that an object is a drink or a bag does not determine the particle’s spelling.

See both pairs in one sentence

저는 시간이 있어요. — “I have time.” Here 저는 sets the person as the topic; 시간이 identifies what is available in the expression 시간이 있어요. You do not need to force one English word to represent each Korean particle.

저는 시간이 없어요. — “I do not have time.” The negative message comes from 없어요. Replacing 는 with 가 is not the way to make a Korean sentence negative.

This is also why the phrase “subject means the person doing an action” is too narrow. Time is not performing an action in 시간이 있어요, but 이 still marks a subject. Learn the whole useful pattern before trying to stretch an English grammar label over every sentence.

There are more uses of both pairs, including topics other than subjects and contrasts involving other parts of a sentence. This lesson gives you a starting set of situations, not a rule that predicts every choice in a novel or conversation.

Repair the explanation, not just the ending

Some sentences can work with either pair in different contexts, or with little noticeable difference in a particular exchange. A useful exercise explains why a choice fits the stated situation. It should not label every other possible sentence ungrammatical.

When practising, write two lines: the prompt and your reply. For example, keep 누가 운전해요? beside 제가 운전해요. Reviewing only an isolated blank removes the information that helped you choose.

Make the choice and explain it

For more practice, return to the introduction dialogue and notice its topics. Then write a different question that would make 제가 a useful answer. Keep the meaning of your exchange clear before adding more vocabulary.

A small listening check

Particle reference and further study

• How to Study Korean: 이/가 and simple sentences — Form selection and an introduction to the particles; this guide uses its own situations and explanations.
• How to Study Korean: particles in questions and replies — Further examples of how the conversation affects the choice, especially identifying a subject.

Reviewed September 3, 2026. Found a mistake? Send a correction.