1. The Pattern '-(À¸)¤¤/´Â/ -(À¸)¤© °Í °°´Ù'
  2. The pattern 'Verb + -(À¸)¤¤ Áö + time word + µÇ´Ù'


1. The Pattern '-(À¸)¤¤/´Â/ -(À¸)¤© °Í °°´Ù : It seems that ...

This pattern is used to indicate a speaker's presumption or conjecture.
1.1 The pattern '-(À¸)¤¤ °Í °°´Ù' is used in the present tense with adjectives or 'ÀÌ´Ù' to express the speaker's thought or opinion. However the pattern -(À¸) ¤© °Í °°´Ù is used in the future tense to indicate the speaker's stronger conjecture or presumption.
  ºñ½Ñ °Í °°¾Æ¿ä. It seems to be expensive.
  ±×ºÐÀÌ ¹Ì±¹»ç¶÷ÀÎ °Í °°¾Æ¿ä. He seems to be an American.
 
 

The difference between the above two examples is as follows:
The sentence "ºñ½Ñ °Í °°¾Æ¿ä." is used when the speaker knows the price, or is seeing the price first hand and is conparing with his/her expectation.
However the sentence "ºñ½Ò °Í °°¾Æ¿ä" is used when the speaker is guessing the price without prior knowledge of the price.

 
 
  ºñ½Ò °Í °°¾Æ¿ä. I think it will be expensive.
  ±×ºÐÀÌ ¹Ì±¹»ç¶÷ÀÏ °Í °°¾Æ¿ä. I think he will be an American.
 
1.2 With general verbs, the pattern '-´Â °Í °°´Ù' is used in the present tense, '(À¸)¤¤in the past tense, and (À¸)¤© in the future tense.
  ºñ°¡ ¿À´Â °Í °°¾Æ¿ä. It seems that it is raining.
  ºñ°¡ ¿Ã °Í °°¾Æ¿ä. It seems that it will rain.
  ºñ°¡ ¿Â °Í °°¾Æ¿ä. It seems that it rained.
1.3 Negation is expressed either in the final verb '°°´Ù' or in the main verb preceding this pattern. There is slight difference in meaning between the two.
  ¾È ºñ½Ñ °Í °°¾Ò¾î¿ä. ( '¾È' negation) It seems that it is not expensive.
  ºñ½ÎÁö ¾ÊÀº °Í °°¾Ò¾î¿ä. It seemed that it was not expensive.
  ºñ½Ñ °Í °°Áö ¾Ê¾Ò¾î¿ä. ('-Áö ¾Ê´Ù' negation) It doesn't seem to be expensive.
1.4 Tense is expressed in the final verb '°°´Ù'.
  ºñ°¡ ¿À´Â °Í °°¾Æ¿ä/°°¾Ò¾î¿ä. It seems that it is raining./ It seemed that -
  ºñ°¡ ¿Â °Í °°¾Æ¿ä/°°¾Ò¾î¿ä. It seems that it was raining. / It seemed that -
  ºñ°¡ ¿Ã °Í °°¾Æ¿ä/°°¾Ò¾î¿ä. It seems that it will rain./ It seemed that -
2. The pattern 'Verb + -(À¸)¤¤ Áö + time word + µÇ´Ù' : since

  This pattern 'Verb + -(À¸)¤¤ Áö + time word + µÇ´Ù' is used to express an interval of time which extends from a definite past to the present. The case marker '-°¡` or '-´Â' can be attached optionally after ¡®Áö'
  Çѱ¹¿¡ ¿Â Áö(°¡) ¾ó¸¶³ª µÇ¾ú¾î¿ä ? How long have you been in Korea ?
  Çѱ¹¿¡ ¿Â Áö(´Â) 3³â µÇ¾ú¾î¿ä. It's been three years since I came to Korea.
  ±×ºÐÀº ¸¸³­ Áö(°¡) 10³âÂë µÇ¾ú¾î¿ä. It's been around ten years since I met him.
-Àº Áö is used after verb stems ending in a consonant.
-¤¤ Áö is used after verb stems ending in a vowel.