How to Make a Casual Polite Form from Infinitive Form

 

 

1. Infinitive Form (Dictionary Form):  

  • Infinitive form of any verb ends with -다.
  • Example>
    • 살다          to live
    • 먹다          to eat
    • 좋다          to be good
    • 마시다       to drink
    • 가다          to go
    • 오다          to come

 

2. Find the stem from a verb

  • Take out -다 from the infinitive form and what is left is the stem
  • Examples>
    • 살다     ---->   살
    • 먹다     ---->   먹
    • 좋다     ---->   좋
    • 마시다  ---->   마시
    • 가다     ---->   가
    • 오다     ---->   오

 

3. Add -아요/-어요 to the stem

  • If the last syllable of the stem has a positive vowel (ㅏ or ㅗ), add -아요.
  • If the last syllable of the stem is not ㅏ or ㅗ, add -어요.
    • Exception> 하다 (to do) ---> 해요  (하+여요)
    • Exception> 이다 (to be) ---> 이에요  or  예요

 

4. Contract two neighboring vowels if possible.

  • 마시 + 어요 ---> 마셔요
  • 가 + 아요 ------> 가요
  • 오 + 아요 ------> 와요

 

All the verbs that follow the above rule are called the regular verbs.

 

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When the final Vowel of the Stem is  “ㅏ”

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When the final Vowel of the Stem is  “ㅗ”

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When the final Vowel of the Stem is  “ㅓ”

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When the final Vowel of the Stem is  “ㅜ”

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When the final Vowel of the Stem is  “l”

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When the final Vowel of the Stem is  “ㅐ” or “ㅔ”

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When the final Vowel of the Stem is  “ㅡ”
 

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