gyeonjeokseoreul meonjeo batgo suribireul cheongguhaesseoyo.

Here -고 links two actions: 받다 → 받고, then 청구했어요.

So the sentence has the pattern:

• 견적서를 먼저 받고 = receive the estimate first
• 수리비를 청구했어요 = then charged/billed the repair cost

In this sentence, -고 is basically and / and then. It often connects actions in sequence.

So the flow is:

1. get the estimate
2. charge the repair cost

In Korean, when two actions are connected with -고, usually only the final verb shows the tense clearly.

So:

• 받고
• 청구했어요

still means:

• received the estimate
• charged the repair cost

Even though 받고 itself is not marked as past, the past tense of the final verb 청구했어요 usually carries over to the whole sequence.

This is very common in Korean.

먼저 means first or before that.

It makes the order especially clear:

• 견적서를 먼저 받고 = first receive the estimate
• 수리비를 청구했어요 = then charge the repair cost

Even without 먼저, the order could often be understood from context, but 먼저 emphasizes that getting the estimate happened before the billing.

Because both are direct objects of their verbs.

• 견적서를 받다 = to receive an estimate document
• 수리비를 청구하다 = to charge/bill repair costs

So:

• 견적서 + 를 → 견적서를
• 수리비 + 를 → 수리비를

Even though there are two -를 particles in one sentence, that is completely normal because each verb has its own object.

Not exactly.

• 견적 = an estimate, a quoted price
• 견적서 = an estimate document, quotation sheet, written estimate

The -서 here means a document or paper.

So 견적서를 받다 suggests receiving the actual written estimate, not just hearing a price verbally.

In this context, 청구하다 means to charge, to bill, or to invoice.

So 수리비를 청구했어요 means:

• billed the repair cost
• charged for the repair

Even though 청구하다 can sometimes be translated as claim in other contexts, here bill/charge is the natural meaning.

That is an important point, because translating it too literally as claimed the repair cost would sound unnatural in English.

The subject is omitted, which is very common in Korean.

So depending on context, it could mean:

• I first received the estimate and billed the repair cost.
• We first received the estimate and billed the repair cost.
• They first received the estimate and billed the repair cost.

Korean often leaves out the subject when it is already understood from the situation.

The sentence itself does not specify that.

It only says:

• someone received the estimate document
• then someone billed the repair cost

Korean often leaves out information like:

• who gave the estimate
• who received it
• who was billed

Those details would come from context.

So grammatically, the sentence focuses on the actions, not all the participants.

청구했어요 is the polite, informal-style ending often called the -아요/어요 style.

Here is the breakdown:

• 청구하다 = to bill/charge
• 청구했- = past tense stem
• 청구했어요 = polite past

This style is very common in everyday speech and writing when speaking politely but not formally.

Less polite:

• 청구했어

More formal:

• 청구했습니다

Yes, but the nuance changes a little.

• 받고 mainly connects two actions in sequence: receive it, then bill
• 받아서 can suggest after receiving it or sometimes because/as a result of receiving it

So:

• 견적서를 먼저 받고 수리비를 청구했어요.
  = First received the estimate, and then billed the repair cost.

• 견적서를 먼저 받아서 수리비를 청구했어요.
  = After receiving the estimate, billed the repair cost.

The original with -고 is a clean, straightforward sequence.

Yes, you often can.

• 견적을 받다 = receive/get an estimate
• 견적서를 받다 = receive the estimate document

The version with 견적서 is a little more specific and concrete because it refers to the written estimate itself.

So both are possible, but 견적서를 emphasizes the document.

Yes. Very naturally.

Because of:

• 먼저 = first
• -고 = and then / and
• the real-world logic of the situation

the sentence is understood as a sequence:

1. get the estimate
2. charge the repair fee

So even though Korean grammar here is simple, the sentence clearly expresses order.

You could change the order grammatically, but it would change the meaning or sound less natural for the intended situation.

Original:

• 견적서를 먼저 받고 수리비를 청구했어요.
• First received the estimate, then billed the repair cost.

If you reversed it:

• 수리비를 청구하고 견적서를 먼저 받았어요.

that would sound odd, because 먼저 would clash with the order, and it would suggest billing happened before getting the estimate.

So the original order is the natural one if the estimate came first.