If I had done...

This pattern is used to talk about a hypothetical situation in the past that is contrary to what actually happened. It's the Korean equivalent of "If I had..." or "Had I...", and it almost always carries a feeling of regret or wishful thinking.

Formation

Attach -았/었더라면 to the stem of a verb or adjective.

Verb stems ending in ㅏ or ㅗ + 았더라면

사다 (to buy) → 샀더라면 (If I had bought)

오다 (to come) → 왔더라면 (If he had come)

Verb stems ending in other vowels + 었더라면

먹다 (to eat) → 먹었더라면 (If I had eaten)

듣다 (to listen) → 들었더라면 (If I had listened)

하다 verbs → 했더라면

공부하다 (to study) → 공부했더라면 (If I had studied)

Usage

Use -았/었더라면 to set up a past condition that did not occur. The clause that follows describes the imagined result. The particle -더- adds a nuance of personal recollection or reflection on a past event.

공부했더라면 서울대 갔어. / 그때 샀더라면 대박인데. / 돈이 있었더라면 샀을 거야.

While many endings are possible, -았/었더라면 most naturally pairs with clauses that express hypothetical outcomes and regret. Here are the most common ones from the script.

-았/었을 텐데(요)

This is the most common pairing. It strongly expresses regret or a lingering feeling about what could have been. It's like saying, "I would have..., but I didn't, and that's a shame."

안 먹었더라면 날씬했을 텐데. (If I hadn't eaten, I would've been slim.)

-았/었을 거야/거예요

This ending expresses a strong guess or conviction about the hypothetical result. It's more focused on the certainty of the outcome than the feeling of regret.

그 버스를 탔더라면 늦었을 거야. (If I had taken that bus, I'm sure I would have been late.)

Trailing Off (...)

Sometimes, speakers end the sentence right after -더라면, leaving the result unsaid. This implies a deep sense of regret or emotion that doesn't need to be spelled out.

너를 만나지 않았더라면... (If only I hadn't met you...)

우산을 가져왔더라면 안 젖었을 텐데. / 조심했더라면 안 다쳤을 거야. / 너를 만나지 않았더라면...

Learners often confuse -았/었더라면 with -았/었다면. While they both create past counterfactuals ("If I had..."), there's a key difference in nuance.

-았/었더라면 (Personal Recollection)

The -더- in this pattern adds a sense of personal experience or reflection. The speaker is looking back on a memory and expressing regret or a hypothetical based on that specific recollection. It feels more personal and emotional.

그때 알았더라면 말했을 거야. (Implies: I remember that moment, and reflecting on it now, if I had known, I would have told you.)

-았/었다면 (General Condition)

This is a more neutral, standard way to state a past hypothetical condition. It lacks the personal, reflective nuance of -더-. It's very common in writing and more formal speech.

그때 알았다면 말했을 거야. (A more straightforward "If I had known then, I would have told you.")

In casual conversation, they are often used interchangeably, but -았/었더라면 carries that extra layer of personal feeling.

공부했더라면 서울대 갔을 텐데. / 공부했다면 서울대 갔을 텐데. / 비가 안 왔더라면 소풍 갔을 텐데. / 비가 안 왔다면 소풍 갔을 텐데.

The -았/었더라면 clause itself does not change for politeness. Instead, the formality of the entire sentence is determined by the ending of the result clause that follows it.

Casual Language (반말)

When speaking to close friends or people younger than you, use casual endings like -았/었을 거야 or -았/었을 텐데.

내가 너였더라면 안 했을 거야. (If I were you, I wouldn't have done it.)

Polite Language (해요체)

When speaking to elders, colleagues, or in more formal situations, use polite endings like -았/었을 거예요 or -았/었을 텐데요.

제가 호리 씨였더라면 안 했을 거예요. (If I were you, I wouldn't have done it.)

Notice how only the final part of the sentence changes to adjust the politeness level.

네 말을 들었더라면 좋았을 텐데. / 호리 씨 말을 들었더라면 좋았을 텐데요. / 알았더라면 왔을 거야. / 알았더라면 왔을 거예요.