는 (neun) and 은 (eun) for SUBJECT
를 (reul) and 을 (eul) for OBJECT
Subject:
*Use (는) if the word ends with a vowel
Ex: 나는 (nⓐneun)
[Na ends with a vowel (a) so you will use neun as a subject particle)
*Use (은) if the word ends with a consonant
Ex: 것은 (geoⓣeun)
[Geot ends with a consonant (t) so you will use eun]
Object:
*Use (를) when the word ends with vowel
Ex: 어를 (ⓔⓞreul)
[Eo ends with a vowel (eo) so use reul as an object particle]
*Use (을) when the word ends with a consonant
Ex: 운을 (uⓝeul)
[Un ends with a consonant (n) so use eul]
OTHER EXAMPLE:
저(는) 매운음식(을) 좋아해요
Jeoneun mae un eum sikeul johahaeyo
[I like spicy foods]
Subject→저는 ▷ (jeo) ends with (eo)
Object→삭을 ▷ (sik) ends with (k)