(Grammar) -은 ,-는 -을 and -를

-은 is used for emphasizing a subject or an object. It is also marks the general topic sentence. -은 follows syllables that end with a consonant.

• 없어요 There isnt.
• 신문 없어요. I dont have a newspaper.
• 신문은 없어요. I dont have the newspaper.
• 여기 신문은 없어요. There is no newspaper here.

-는 is used for emphasing a subject or an object. -는 follows syllables that end with a vowel.

• 사과는 참 맜있어요. The apple tastes very good.
• 누나는 너무 예뻐요. The girl (older than the boy speaker) is so pretty.

-는 can be compressed in a word,example

• 누나는 to 누난
• 나는 to 난
• 너는 to 넌

-을 is an object marker. It follows nouns which end with a consonant.

• 김밥을 안먹어요? Dont you eat kimbab?
• 오늘 비빔밥을 먹었어요. I ate Bibimbap today.

-를 is an object marker. It follows nouns which end with a vowel. The object markers are optional in conversation that means you want to use it or not,it is up to you.

• 영화를 봤어요? Have you watched the movie?
• 나를 따라해. Follow me.
• 그대를 사랑해.  Its you that I love. (너,당신,그대 means 'you')

Learn how to read in Korean here.