Talking about Weekend Plans

Putting -러 [reo] after a verb explains the reason for going or coming somewhere.

• 먹다 [meok-da] to eat → 먹으러 [meo-geu-reo] in order to eat
• 마시다 [ma-si-da] to drink → 마시러 [ma-si-reo] in order to drink
• 읽다 [ilk-da] to read → 읽으러 [il-geu-reo] in order to read
• 공부하다 [gong-bu-ha-da] to study → 공부하러 [gong-bu-ha-reo] in order to study

When the verb stem ends in a CONSONANT sound, we use -으러 [eu-reo]

• 아침을 먹- [a-chim-eul meok-]
• 사진을 찍- [sa-jin-eul jjik-]

When the verb stem ends in a VOWEL sound, we use -러 [reo]

• 여행을 가- [yeo-haeng-eul ga-]
• 선물을 주- [seon-mu-reul ju-]

왜 학교에 가요? [wae hak-gyo-e ga-yo?]
Why are you going to school?

• 왜 [wae] means "why"
• 학교에 가요? [hak-gyo-e ga-yo?] means "Do you go to school?"
• Literally means "why, Do you go to school?"

공부하러 학교에 가요. [gong-bu-ha-reo hak-gyo-e ga-yo]
I'm going to school to study.

• 공부하러 [gong-bu-ha-reo] means "In order to study"
• 학교에 가요 [hak-gyo-e ga-yo] means "I go to school"
• Literally means "In order to study, I go to school"

책을 읽으러 도서관에 가요. [chae-geul il-geu-reo do-seo-gwan-e ga-yo]
I'm going to the library to read a book.

• 책을 읽으러 [chae-geul il-geu-reo] means "in order to read a book"
• 도서관에 가요 [do-seo-gwan-e ga-yo] means "I go to the library"

We can use purpose ending -러 only with verbs of motion like '오다' [o-da] come / '가다' [ga-da] go

• 아침을 먹으러 갔어요. [a-chim-eul meo-geu-reo ga-sseo-yo] I went to have breakfast.
• 선물을 주러 왔어요. [seon-mu-reul ju-reo wa-sseo-yo] I came to give a gift.

• A: 오늘 어디에 가요?
  Where are you going today?
• B: 카페에 가요. [ka-pe-e ga-yo]
  I'm going to the cafe.
• A: 왜 카페에 가요?
  Why are you going to the cafe?
• B: 공부하러 카페에 가요. [gong-bu-ha-reo ka-pe-e ga-yo]
  I'm going to the cafe to study.
• A: 내일 어디에 가요?
  Where are you going tomorrow?
• B: 쇼핑하러 백화점에 가요. [syo-ping-ha-reo bae-kwa-jeom-e ga-yo]
  I'm going to the department store to go shopping.
• A: 같이 가요!
  Let's go together!