Question 1

What does 밤에도 mean, and what is the function of -에도 here?

Accepted Answer

밤에 means at night. Adding 도 gives 밤에도, which means also at night or even at night, depending on context.

Here, 도 adds the idea that the fever continues during the night too, not just during the day. So it emphasizes that the symptom is still happening at night.

- 밤에 = at night  
- 밤에도 = also at night / even at night

Question 2

Why is it 열이 나다? Why not something like 열이 있다?

Accepted Answer

In Korean, 열이 나다 is the natural expression for to have a fever or literally for fever to come out / appear. This is just the standard Korean way to say it.

So:

- 열이 나다 = to have a fever
- 열이 있다 would sound unnatural for this meaning

This is a good example of a Korean expression that does not match English word-for-word. Even though English uses have, Korean uses 나다.

Question 3

Why is 열 marked with 이?

Accepted Answer

In 열이 나다, 열 is the subject of the verb 나다.

Korean treats this expression like:

- 열이 난다 = fever appears / a fever occurs

So 이/가 is used because 열 is the thing that is happening or appearing.

This pattern is common with certain bodily conditions:

- 땀이 나다 = sweat comes out / to sweat
- 콧물이 나다 = mucus comes out / to have a runny nose
- 열이 나다 = to have a fever

Question 4

What does 계속 do in this sentence?

Accepted Answer

계속 means continuously, continually, or keep on.

It modifies the verb phrase 열이 나다, so 열이 계속 나면 means if the fever keeps continuing or if the fever keeps happening.

It adds the idea that this is not a one-time fever, but something that persists.

Question 5

How does -면 work in 나면?

Accepted Answer

-면 is a conditional ending meaning if or when.

Here:

- 나다 → 나면
- 열이 계속 나면 = if the fever continues / if the fever keeps happening

This structure is very common in Korean for conditions:

- 아프면 = if you are sick / if it hurts
- 시간이 있으면 = if you have time
- 비가 오면 = if it rains

So in this sentence, the first part sets the condition, and the second part gives the result or necessary action.

Question 6

What does 응급실에 가야 해 mean grammatically?

Accepted Answer

가야 해 comes from 가야 하다, which expresses necessity or obligation: have to go, must go, should go.

Breakdown:

- 가다 = to go
- -아/어야 하다 = have to / must

So:

- 가야 하다 = have to go
- 가야 해 = have to go (casual spoken form)

And 응급실에 means to the emergency room, with 에 marking the destination.

So grammatically, this part says that going to the emergency room is necessary.

Question 7

Is 가야 해 casual? How would I say it more politely?

Accepted Answer

Yes, 가야 해 is casual or plain spoken style. It is natural in conversation, especially when speaking to someone close, a child, or in informal contexts.

More polite versions include:

- 응급실에 가야 해요. = You have to go to the ER.
- 응급실에 가야 합니다. = You must go to the ER.  
  This is more formal.

So the sentence can be adjusted depending on the situation:

- casual: 가야 해
- polite everyday: 가야 해요
- formal: 가야 합니다

Question 8

Who is the subject of 가야 해? Why isn’t you stated?

Accepted Answer

Korean often leaves out subjects when they are clear from context.

In this sentence, the understood subject is usually you or the patient. Korean does not need to say you explicitly if the listener can figure it out.

So the full idea is something like:

- (너는/환자는) 응급실에 가야 해.
- You / the patient have to go to the ER.

This omission is very normal in Korean and happens constantly in everyday speech.

Question 9

Does 밤에도 mean also at night or even at night?

Accepted Answer

It can suggest either one, depending on context.

- also at night = the fever continues at night too
- even at night = emphasizing that it lasts through the night, which may sound more serious

In a medical context like this, even at night often feels natural in English because it highlights persistence. But grammatically, 도 itself simply adds also/too, and the stronger nuance often comes from context.

Question 10

What is the basic word order of this sentence?

Accepted Answer

The sentence follows a very common Korean pattern:

condition + result/obligation

So:

- 밤에도 = at night too
- 열이 계속 나면 = if the fever continues
- 응급실에 가야 해 = you have to go to the emergency room

A rough structure is:

[Time/addition] + [subject + verb + if] + [place + must go]

Korean usually puts the condition before the main statement, unlike English, where either order is possible.

Question 11

Could I say 응급실로 가야 해 instead of 응급실에 가야 해?

Accepted Answer

Yes, 응급실로 가야 해 is possible, but 응급실에 가야 해 is the more neutral and common way to say go to the emergency room.

Very roughly:

- 에 focuses on the destination
- 로 can emphasize direction or route

With 가다, both can appear, but 에 가다 is the standard pattern learners should be most comfortable with first.

So for this sentence, 응급실에 가야 해 is the safest and most natural choice.

Question 12

What is the difference between 가야 해 and 가야 돼?

Accepted Answer

Both mean have to go in everyday speech.

- 가야 해 comes from 가야 하다
- 가야 돼 comes from 가야 되다

In conversation, both are extremely common and often interchangeable.

Very generally:

- 가야 해 can sound a little more direct or neutral
- 가야 돼 can sound a little more conversational

But in most everyday situations, the difference is small. A learner can safely understand both as expressing necessity.

Question 13

Why isn’t there a particle after 계속?

Accepted Answer

Because 계속 is being used as an adverb here.

It directly modifies the verb 나다, so no particle is needed:

- 열이 계속 나면 = if the fever keeps happening

If 계속 were used as a noun in some other sentence, it might take a particle. But here it functions adverbially, so it appears by itself.

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