(Grammar) Present Tense, Past Tense and place marker.

• Present Tense is Korean is a verb that added with 해요. That means, something that you are presently do.

• 뭐 공부해요? What do you study?
• 한국어 공부해요. I study Korean.
• 언제 시작해요? When does it begin?
• 한 시에 시작해요. It begins at 1 o'clock.

Past Tense in Korean is a verb that added with 했어요. Look at the ~ㅆ어요 at the word, any word that have this means it is describing something that had been done in the past.

• 공부했어요? Did you study?
• 공부했어요.. I studied..
• 일했어요? Did you work?
• 일했어요. I worked.

-었어요 is a past tense ending that follows verb stems with vowels 어,여,우,유,으,이 and final consonants.

• 감기 걸렸어요? You cought a cold?
• 감기 결렸어요.. I cought a cold..

-았어요 is the same meaning as -었어요, but is follows verbal stems with vowel such as '아, 야, 오, 요' and final consonants.

• 학교에 갔어요? Did you go to the hospital?
• 학교에 갔어요. I went to the hospital.

The place marker in Korean is -에.

• 학교 (school)
• 학교에 (to school)
• 학교에 가요? Do you go to school?

to tell that something happen in that place, just put 에서 which means 'at'

• 학교에서 공부해요. I study at school.
• 집에서 공부해요. I study at school.

Learn how to read in Korean here.