hyudaeponeul jibe dugo wa beoryeosseoyo.

A natural breakdown is:

• 휴대폰을 = cell phone
  • object marker -을
• 집에 = at/to home
• 두고 = leave/put
  • -고 (and)
• 와 = come
• 버렸어요 = past polite form of auxiliary 버리다

So the core pattern is 두고 오다, which literally means leave something somewhere and come.

The full sentence is built from 휴대폰을 집에 두고 오다 + -아/어 버리다 + past polite ending, giving the nuance of I ended up leaving my phone at home.

Because 휴대폰 is the thing being left behind, so it is the object of the verb.

• 휴대폰을 두고 오다 = to leave the phone behind and come

The particle -을/를 marks the direct object. In casual conversation, Korean sometimes drops object particles, but in a clear textbook-style sentence, 휴대폰을 is the normal form.

Here, 집에 marks the place where the phone was left.

In this sentence, the important idea is the phone’s resulting location: it is now at home. That is why 에 is used.

A simple way to think about it:

• 에 = location/destination/resulting place
• 에서 = place where an action takes place

Since the phone was left at home, 집에 두고 오다 is the natural expression.

Literally, it means put/leave and come.

Korean often links verbs with -고 to show one action followed by another:

• 두고 = leave it there
• 오다 = come

So 두고 오다 means:

1. you leave something somewhere
2. then you come away from that place

That is why this expression is used for leaving something behind.

Korean often expresses this idea more explicitly than English.

Instead of one verb meaning leave behind, Korean commonly uses a verb chain:

• 두다 = put, leave
• 오다 = come

Together, they show both the action and the movement afterward:

• you left the phone at home
• then you came from home to wherever you are now

So even though English uses one simple verb, Korean naturally uses a multi-verb structure here.

Because the sentence is being described from the speaker’s current point of view.

• 오다 = come
• 가다 = go

두고 와 버렸어요 suggests:
I left it at home and came here.

That fits a situation where the speaker is now somewhere away from home.

If you used 가다, the viewpoint would be different. Very roughly:

• 두고 오다 = leave it there and come here
• 두고 가다 = leave it there and go away

In real conversation, both types can appear depending on perspective, but 두고 오다 is very common when the speaker realizes they left something at home and is now elsewhere.

버렸어요 adds a nuance of completion, often with a feeling like:

• regret
• annoyance
• accident
• oops, it happened

So:

• 휴대폰을 집에 두고 왔어요 = I left my phone at home.
• 휴대폰을 집에 두고 와 버렸어요 = I ended up leaving my phone at home / I accidentally left my phone at home / I left my phone at home, unfortunately.

It makes the sentence feel more emotional and less neutral.

No. Here it is not being used with its full literal meaning.

On its own:

• 버리다 = to throw away, discard

But after another verb, as in -아/어 버리다, it often works as an auxiliary verb. In that use, it usually means something like:

• do completely
• end up doing
• do unfortunately

So in this sentence, it does not mean the speaker threw the phone away. It just adds the unfortunate completed-result feeling.

Yes, absolutely.

• 휴대폰을 집에 두고 왔어요 = a more neutral statement
• 휴대폰을 집에 두고 와 버렸어요 = same basic fact, but with more regret or frustration

So if you just want to state the fact, leave out 버렸어요.
If you want the Oh no feeling, keep it.

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

In English, you usually need I. In Korean, if everyone already knows who is speaking, you can simply say:

• 휴대폰을 집에 두고 와 버렸어요.

If you want to emphasize the subject, you could add it:

• 제가 휴대폰을 집에 두고 와 버렸어요.

That can sound a bit more explicit, like I’m the one who left it at home.

Yes. 놓고 오다 is also very common for leave something behind.

So these are both natural:

• 휴대폰을 집에 두고 왔어요
• 휴대폰을 집에 놓고 왔어요

In everyday speech, many people use 놓고 오다 very often for forgotten items. The difference is small enough that learners can treat them as near-equivalents in this kind of sentence.