kuponi isseumyeon i sinbareul deo ssage sal su isseoyo.

If you have a coupon, you can buy these shoes more cheaply.

Breakdown of kuponi isseumyeon i sinbareul deo ssage sal su isseoyo.

• ~이: subject particle
• ~을: object particle
• 이: this
• 있다: to have

Questions & Answers about kuponi isseumyeon i sinbareul deo ssage sal su isseoyo.

Why is 쿠폰이 marked with 이 instead of 을/를?

Because 쿠폰 is the thing that exists / is available, not the thing being bought.

In 쿠폰이 있으면, the verb is 있다 (to exist, to have). With 있다, the thing that exists usually takes 이/가.

• 쿠폰이 있다 = There is a coupon / You have a coupon

So here, 쿠폰이 있으면 means if there is a coupon or if you have a coupon.

If you used 쿠폰을, it would sound wrong with 있다.

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What does -으면 mean in 있으면?

-으면 / -면 makes an if/when clause.

• 있다 → 있으면 = if there is / if you have
• 가다 → 가면 = if/when (someone) goes
• 먹다 → 먹으면 = if/when (someone) eats

So:

• 쿠폰이 있으면 = if you have a coupon

This pattern is very common for conditions.

A quick rule:

• after stems ending in a consonant: -으면
• after stems ending in a vowel: -면

Since 있다 has the stem 있-, it becomes 있으면.

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Why is it 싸게, not 싼 or 싸다?