을/를 and 가/이
Are you confused when is 가/이 in the middle of sentence?
Let's check it together!
을/를 is used for object like "I don't know what(을/를) to do"
- What(을/를) do you eat? / I eat dinner(을/를)
을 comes after consonant :ㅂ of 밥 + 을
를 comes after vowel : ㅜ of 공부 + 를
가/이 makes noun as complement (보어) after subject.
In this case we don't need to do something by sentence itself.
I have many homework(이/가) : 나는 숙제가 많다
so it will go to like this : I have many homework(이/가) so I have to do work(을/를) hard.
나는 숙제가 많다 그래서 숙제를 열심히 해야 한다.
Hope this helps you
이 comes after consonant :ㅂ of 밥 + 이
가 comes after vowel : ㅔ of 숙제 + 가