oraesdongan i gongyu opiseureul iyonghaesseoyo.

오랫동안 means for a long time. It emphasizes the length of time something continued.

A very similar word is 오래, which also means for a long time. In many cases, they are close in meaning:

• 이 공유 오피스를 오랫동안 이용했어요.
• 이 공유 오피스를 오래 이용했어요.

Both are natural.
오랫동안 can feel a bit more explicit or slightly more written/formal, while 오래 is very common in everyday speech.

이 means this and comes before the noun it describes.

So:

• 이 공유 오피스 = this shared office / this coworking office

In Korean, demonstratives like 이 (this), 그 (that), and 저 (that over there) go directly before the noun.

Examples:

• 이 책 = this book
• 그 사람 = that person
• 저 건물 = that building over there

공유 오피스 is a very common modern Korean expression. It is partly native/Korean-based and partly borrowed:

• 공유 = sharing / shared
• 오피스 = office

Together, 공유 오피스 usually means shared office or coworking space.

Yes, it is normal Korean usage, especially in business or urban contexts. Even though 오피스 comes from English, this kind of borrowing is very common in Korean.

A more purely Korean-looking phrase might be something like 공유 사무실, but 공유 오피스 is very common and natural.

The -를 is the object particle. It marks 공유 오피스 as the thing being used.

So:

• 공유 오피스 = shared office
• 공유 오피스를 = shared office + object marker

The verb 이용하다 takes an object, so the place/facility being used gets 을/를.

Examples:

• 버스를 이용해요. = I use the bus.
• 도서관을 이용해요. = I use the library.
• 이 공유 오피스를 이용했어요. = I used this shared office.

Because 오피스 ends in a vowel sound, it takes -를, not -을.

이용하다 means to use, but it is often used for services, facilities, systems, transportation, or places.

So it fits very naturally with things like:

• 시설을 이용하다 = use a facility
• 지하철을 이용하다 = use the subway
• 서비스를 이용하다 = use a service

사용하다 also means to use, but it often sounds more general and is commonly used for objects, tools, devices, methods, language, etc.

Examples:

• 컴퓨터를 사용하다 = use a computer
• 이 앱을 사용하다 = use this app

In this sentence, 이용하다 sounds more natural than 사용하다 because a 공유 오피스 is a facility/service-type place.

이용했어요 is the past tense of 이용하다 in the polite -어요 style.

Formation:

• 이용하다
• 이용했어요

Literally, it means used.

But in Korean, the past tense can sometimes overlap with English expressions like:

• used
• have used
• sometimes even have been using, depending on context

So the exact English translation depends on the situation.

For example:

• If you no longer use it, it may mean I used this shared office for a long time.
• If you are talking about your experience up to now, it could feel closer to I’ve used this shared office for a long time.

If you want to clearly say the action is ongoing right now, Korean often uses:

• 이 공유 오피스를 오랫동안 이용하고 있어요. = I have been using this shared office for a long time / I’ve been using it

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

So even though English usually needs I, Korean does not have to say 저는 or 나는 every time.

This sentence could be expanded to:

• 저는 오랫동안 이 공유 오피스를 이용했어요.

But in normal conversation, leaving out 저는 is very natural if the listener already knows who you are talking about.

This is one of the biggest differences from English: Korean relies heavily on context.

Yes. Korean word order is flexible as long as the grammatical markers are clear.

The original sentence is:

• 오랫동안 이 공유 오피스를 이용했어요.

A very natural alternative is:

• 이 공유 오피스를 오랫동안 이용했어요.

Both mean essentially the same thing.

The difference is mainly focus:

• 오랫동안 first: emphasizes the duration early
• 이 공유 오피스를 first: emphasizes what was used

Because Korean puts the verb at the end, elements before the verb can move around more freely than in English.

It modifies the verb, not the noun.

So it tells you how long the action of using happened.

Structure:

• 오랫동안 = for a long time
• 이 공유 오피스를 = this shared office
• 이용했어요 = used

So the meaning is:

• used this shared office for a long time

It does not mean this long-term shared office or anything like that.

이용했어요 is in the polite informal style, often called the -아요/어요 style.

It is very common in everyday conversation and is polite enough for many normal situations.

Compare:

• 이용했어 = casual, plain intimate speech
• 이용했어요 = polite everyday speech
• 이용했습니다 = more formal and official

So this sentence sounds polite and natural in normal conversation.

Not exactly. 다니다 means to go regularly to / attend / commute to, so it focuses on going to the place, not really using the service/facility itself.

Compare:

• 공유 오피스를 이용했어요. = I used the shared office.
• 공유 오피스에 다녔어요. = I went to the shared office regularly.

Both could work in the right context, but they are not the same.

If you want to emphasize that you were a user/member/customer of the space, 이용했어요 is a very good choice.

If you want to clearly express I have been using this shared office for a long time, Korean often prefers a progressive form:

• 오랫동안 이 공유 오피스를 이용하고 있어요.

This makes the ongoing state more explicit.

Very roughly:

• 이용했어요 = used / have used
• 이용하고 있어요 = am using / have been using

So the original sentence is fine, but 이용하고 있어요 removes some ambiguity if the action is still continuing now.