Object Particles - 을/를

을 and 를 are object particles which come after a noun and shows the "object" of the verb.

When the noun ends in a consonant, you will use "을".

When the noun ends in a vowel, you will use "를".

Here are two examples:-

1. 책 : 책 + 을 ---> 책을
2. 교과서 : 교과서 + 를 ---> 교과서를

In spoken language, it may be omitted or abbreviated into "-ㄹ" after a vowel.

Here's an example using the abbreviation:-

1. 영화를 보고 커피를 마셨어요 ---> "영활 보고 커필 마셨어요"

I'll now give you some example sentences, including their English translation:-

1. 신문을 봅니다 --- I read a newspaper.
2. 커피를 마십니다 --- I drink a cup of coffee.
3. 수영을 합니다 --- I swim
4. 지우개를 삽니다 --- I buy an eraser.