Supporting Opinions with Reasons — I can support an opinion with a simple reason using connectors (because, so, but).

Expressing opinions is a universal human activity, but every language has its own way of structuring arguments and linking ideas together. In Korean (한국어), the ability to state an opinion and back it up with a reason has always been deeply connected to cultural norms of politeness and logical communication. Throughout the history of the Korean language, speakers have developed specific grammatical tools—called connectors (접속사 and connective endings)—to create smooth, persuasive sentences that sound natural rather than choppy or disconnected.

Understanding these connectors is essential because Korean sentence structure differs significantly from English. Korean is a subject-object-verb (SOV) language, meaning the verb comes at the end of the sentence. Connectors therefore play a crucial role in signaling how ideas relate to one another before the listener even hears the main verb. This lesson focuses on three of the most commonly used connectors for supporting opinions in everyday Korean conversation.

The central question this lesson addresses is straightforward: How do you move beyond simply stating what you think in Korean and actually explain why you think it? Mastering connectors like "because," "so," and "but" will transform your Korean from a list of isolated statements into fluid, convincing conversation.

Before diving into sentence construction, you need to understand the three foundational connectors this lesson covers. Each one serves a distinct logical function: providing a reason, stating a result, or introducing a contrast. In Korean, these connectors are typically verb endings (attached directly to verbs or adjectives) rather than standalone words placed between clauses as in English. This is one of the biggest conceptual shifts for English-speaking learners.

As the diagram illustrates, the fundamental sentence pattern in Korean places the reason or background information first, followed by the connector, and then the opinion or conclusion. This is the reverse of how many English speakers naturally construct sentences ("I like this movie because the acting is good"). In Korean, you would more naturally say the equivalent of "The acting is good, so/because I like this movie." Getting comfortable with this flow is half the battle—once you internalize the pattern, the connectors themselves are straightforward to use.

1. Because: -(으)니까 and -아/어서

Korean has two primary ways to say "because," and choosing between them matters. The ending -(으)니까 is used when you want to emphasize your personal discovery, experience, or justification—especially when the second clause is a command, suggestion, or subjective opinion. You attach -니까 to verb/adjective stems ending in a vowel, and -으니까 to stems ending in a consonant.

The ending -아/어서 is more neutral and objective. It states a simple cause-and-effect without the speaker's strong personal emphasis. Importantly, -아/어서 cannot be used before commands or suggestions. For example, you would say "비가 오니까 우산을 가져가세요" (Because it's raining, take an umbrella), never "비가 와서 우산을 가져가세요."

2. So / Therefore: 그래서

Unlike the verb endings above, 그래서 is a standalone conjunction that sits between two complete sentences. The first sentence presents a fact or situation, and 그래서 introduces the resulting action or opinion. It literally breaks down as 그래 (like that) + 서 (because/and then), meaning "because of that" or "so." You can think of it as the result-facing cousin of -아/어서.

3. But: -지만 and 하지만

The ending -지만 attaches to the verb or adjective stem of the first clause to create a contrast with the second clause. It works in both polite and casual speech. Meanwhile, 하지만 is a standalone conjunction (하다 + -지만) placed between two full sentences, functioning exactly like "however" in English. Both are extremely common in daily conversation, and using them lets you present a balanced, nuanced opinion rather than a one-sided statement.

The decision tree above is your go-to reference. In real conversation, you will not have time to consult a chart, but practicing with it will help you internalize the logic. Over time, choosing the right connector will become automatic—just as you do not consciously think about whether to use "because" or "so" when speaking English.

Let's walk through the process of constructing a full opinion-with-reason sentence in Korean. Imagine a friend asks you: "한국 음식을 좋아해요?" (Do you like Korean food?). You want to say: "I like Korean food because it's spicy and delicious."

Each connector has a specific conversational "feel." Choosing the right one is not just about grammar—it is about what kind of relationship you want to establish between your ideas. The table below compares the three connector families side by side.

The three connectors you have learned in this lesson are foundational, but Korean has a much richer set of connective tools that you will encounter as you advance. Knowing how today's connectors relate to more complex ones will give you a roadmap for future study.

As you progress, you will also learn to stack multiple connectors in a single complex sentence, a technique common in Korean writing and formal speech. For now, mastering -(으)니까, 그래서, and -지만 gives you the essential toolkit to hold your own in any casual Korean conversation where opinions are exchanged. Think of these three as your foundation—every advanced connector builds on the same logical relationships of cause, result, and contrast.