스물

§ Understanding '스물' (seumul)

The Korean word '스물' (seumul) means 'twenty.' It's a native Korean number, and like other native Korean numbers, it's used for specific things, primarily counting people, ages, and some common items. Many learners, especially beginners, get confused between native Korean numbers and Sino-Korean numbers. Let's clear up some common pitfalls.

§ Mistake 1: Using '이십' (isip) instead of '스물' (seumul) for counting people or age

This is perhaps the most frequent mistake. Korean has two sets of numbers: native Korean numbers (하나, 둘, 셋, 넷, 다섯...) and Sino-Korean numbers (일, 이, 삼, 사, 오...). '스물' is a native Korean number, while '이십' (isip) is the Sino-Korean equivalent for twenty. You use native Korean numbers for counting people and age.

WHAT YOU MIGHT SAY (INCORRECT)

저는 이십 살이에요. (Jeoneun isip sarieyo.)

WHAT YOU SHOULD SAY (CORRECT)

저는 스무 살이에요. (Jeoneun seumu sarieyo.)

Notice how '스물' changes to '스무' when followed by a counter like '살' (sal - for age). This is a common phenomenon with native Korean numbers (하나, 둘, 셋, 넷 also change). More on that below!

§ Mistake 2: Forgetting the short form '스무' (seumu)

As hinted above, '스물' (seumul) shortens to '스무' (seumu) when it comes before a counter word. This is a crucial grammatical point for native Korean numbers one through four, and also for twenty. You can't just use '스물' for everything. If you say '스물 살' (seumul sal), it will sound unnatural to a native speaker.

• INCORRECT

  스물 개 (seumul gae - twenty pieces)

• CORRECT

  스무 개 (seumu gae - twenty pieces)

The same rule applies to '한' (han), '두' (du), '세' (se), '네' (ne) for one, two, three, and four, respectively.

§ Mistake 3: Using '스물' for numbers beyond 99

Native Korean numbers only go up to 99. Once you hit 100, you switch entirely to Sino-Korean numbers. So you'll never say '스물 백' (seumul baek) for one hundred twenty. That's just not how it works.

WHAT YOU MIGHT SAY (INCORRECT)

저는 백 스물 살이에요. (Jeoneun baek seumul sarieyo - for 120 years old)

WHAT YOU SHOULD SAY (CORRECT)

저는 백이십 살이에요. (Jeoneun baegisip sarieyo - for 120 years old)

For numbers 100 and above, you exclusively use Sino-Korean numbers, even when counting things that typically use native Korean numbers for smaller quantities. This is a common point of confusion for many learners.

§ Recap of '스물' (seumul) usage

To avoid these common mistakes, remember these key points for '스물' and other native Korean numbers:

• Use '스물' (seumul) or '스무' (seumu) for counting up to 99.
• It's primarily for age, counting people, and specific items (e.g., hours, bottles, pairs).
• Always use the shortened form '스무' before a counter word.
• For numbers 100 and above, switch to Sino-Korean numbers (이십, 삼십, 사십...).

Practice makes perfect! Pay attention to how native speakers use these numbers, and don't be afraid to make mistakes. Learning these distinctions will significantly improve your Korean fluency.