keopieseo seoltangeul ppaesseo.

Here, 에서 means from.

So in 커피에서 설탕을 뺐어, 커피에서 means from the coffee.
This is a very common use of 에서 with verbs that involve taking, removing, separating, or getting something out of something.

A few similar examples:

• 물에서 소금을 뺐어. = I removed the salt from the water.
• 가방에서 책을 꺼냈어. = I took a book out of the bag.

So although 에서 often marks the place where an action happens, it can also mark the source or starting point of removal.

Because 설탕 is the direct object of the verb 빼다.

The verb 빼다 means things like:

• to remove
• to take out
• to exclude
• to subtract

In this sentence, the thing being removed is 설탕, so it takes the object marker 을:

• 설탕을 뺐어 = removed the sugar

So the structure is basically:

• 커피에서 = from the coffee
• 설탕을 = the sugar
• 뺐어 = removed

In this sentence, 빼다 means to remove or to take out.

It is a very flexible verb in Korean. Depending on context, it can mean:

• remove something from something
• leave something out
• exclude something
• subtract

Examples:

• 안경을 뺐어. = I took off my glasses.
• 이름을 명단에서 뺐어. = I removed the name from the list.
• 10에서 3을 빼. = Subtract 3 from 10.

So in 커피에서 설탕을 뺐어, it means removed the sugar from the coffee.

빼다 is the dictionary form.
뺐어 is the informal past form.

The conjugation works like this:

• dictionary form: 빼다
• stem: 빼-
• past marker: -었-
• informal ending: -어

This combines into 빼었어, which contracts to 뺐어.

So:

• 빼다 = to remove
• 뺐어 = removed / took out

This is very common in Korean: forms often contract in speech and writing.

Because Korean often leaves out the subject when it is obvious from context.

So 커피에서 설탕을 뺐어 could mean:

• I took the sugar out of the coffee.
• He/She took the sugar out of the coffee.
• We/They took the sugar out of the coffee.

The subject is understood from the situation.

This is extremely normal in Korean. In natural conversation, Korean speakers often omit:

• the subject
• the object
• anything else that is already clear

So the sentence is not incomplete. It is just natural Korean.

Yes, it is grammatical and understandable, but whether it sounds fully natural depends on the situation.

If you literally mean that there was already sugar in the coffee and someone removed it, then 커피에서 설탕을 뺐어 works.

However, in real life, once sugar is dissolved in coffee, you usually do not literally take it out, so the sentence can sound a little unusual unless the context makes sense. For example:

• maybe the sugar had not dissolved yet
• maybe this is about ingredients in a recipe
• maybe it means sugar was excluded from a coffee order

In everyday situations, if you mean I had coffee without sugar or I left sugar out of the coffee, Korean speakers might more naturally say things like:

• 커피에 설탕을 안 넣었어. = I did not put sugar in the coffee.
• 커피에서 설탕을 뺐어 can still work if you really want the idea of removal.

The difference is mainly remove vs. not add.

• 커피에서 설탕을 뺐어
  = I removed sugar from the coffee.
  This implies sugar was there, or at least that you are presenting it as something taken out.

• 커피에 설탕을 안 넣었어
  = I did not put sugar in the coffee.
  This simply means the coffee was made without sugar.

English sometimes treats these ideas similarly, but Korean distinguishes them clearly.

So if you are ordering coffee and want to say no sugar, 안 넣다 is often more natural than 빼다.

Yes. In food contexts, 빼다 is often used to mean leave out, skip, or hold an ingredient.

For example:

• 양파 빼 주세요. = Please leave out the onions.
• 치즈 빼고 주세요. = Please give it to me without cheese.
• 설탕 빼 주세요. = Please leave out the sugar.

In these cases, 빼다 often does not mean physically removing something after it was added. It can simply mean prepare it without that ingredient.

So depending on context, 커피에서 설탕을 뺐어 could also be understood more broadly as I had the sugar removed from the coffee or I made it without sugar, though the most literal meaning is still removed sugar from the coffee.

Because the sentence focuses on removal from inside something.

Compare:

• 커피에 설탕을 넣었어. = I put sugar into the coffee.
• 커피에서 설탕을 뺐어. = I removed sugar from the coffee.

So:

• 에 often marks a destination or location something goes into
• 에서 here marks the source something comes out of

This pair is very common:

• 물에 넣다 = put into water
• 물에서 꺼내다 / 빼다 = take out from water

뺐어 is informal, casual speech.

It is the 반말 style, used with:

• close friends
• younger people
• children
• people you are very comfortable with

If you want a polite version, you would say:

• 커피에서 설탕을 뺐어요.

If you want to say it as a request, you might say:

• 커피에서 설탕 좀 빼 주세요. = Please remove the sugar from the coffee.
• more naturally in many situations: 설탕 빼 주세요. = Please leave out the sugar.

A natural pronunciation is approximately:

• 커피에서 → 커피에서
• 설탕을 → 설탕을
• 뺐어 → sounds close to 뻬써

The biggest point learners usually notice is 뺐어:

• it is written 뺐어
• it is pronounced with a tense ㅃ sound at the beginning

So the whole sentence sounds roughly like:

커피에서 설탕을 뻬써

Of course, that is only an approximation using English spelling.

Not in this basic sentence.

You need 설탕을 because 설탕 is what is being removed, so it is the direct object.

• 설탕을 뺐어 = removed the sugar

If you said 설탕이, it would change the grammar and would no longer fit this simple sentence naturally.

The object marker 을/를 is the normal choice with 빼다 when you say what was removed:

• 뭘 뺐어? = What did you remove?
• 설탕을 뺐어. = I removed the sugar.

Not directly.

커피에서 설탕을 뺐어 describes an action: someone removed the sugar from the coffee.

If you want to describe the coffee's state, you would use a different expression, for example:

• 이 커피는 설탕이 안 들어갔어. = This coffee does not have sugar in it.
• 이 커피는 무가당이야. = This coffee is unsweetened.
• 설탕 없는 커피야. = It is coffee without sugar.

So your sentence is about what someone did, not just what the coffee is like.