"The mountain is in the park."
Translation:산은 공원에 있습니다.
Hi MariaAndis, this is what 90daykorean.com (https://www.90daykorean.com/korean-particles/#-do-also) says about the difference between the two:
"Here’s a simple trick to explain the difference between ~은/는 (~eun / neun) and ~이/가 (~i / ga):
While you can use ~은/는 (~eun / neun) to describe someone’s profession or nationality and the like, or describe someone or yourself with an adjective, you cannot use ~이/가 (~i / ga) to do the same. Think of ~은/는 (~eun / neun) as the subject markers to use with descriptive sentences. Similarly, when you want to describe that you or someone else will do something, it’s better to use ~이/가 (~i / ga) rather than ~은/는 (~eun / neun). So think of ~이/가 (~i / ga) as the subject markers to use with actions. When a new subject is being talked about in a conversation, Koreans use 이/가 (~i / ga) to mark the subject. After the subject has been declared and is known to those involved in the conversation (became a topic), then 은/는 (eun / neun) are often used. But remember, this isn’t always the case. It’ll become easier with practice..."
I still find it a little daunting (especially the third point here), but hope it helps :-)
Both means I eat rice.
Stories about "I eat rice":
There are some food on the table. But there is no rice anymore, and then somebody asks about (where is) the rice. And the other answers "제가 밥은 먹어요" (litterally: as for the rice, I eat it)
At the classroom, a teacher asks students what do/did they eat. The student say "저는 밥을 먹어요" (litterally: as for me, I eat rice)
The subject marker shows who is doing the action. Here the topic marker is used. The topic is what the speaker is talking about. https://www.duolingo.com/skill/ko/basics-1/tips-and-notes
있습니다 means "... have it" while 입니다 "...is thing/person. Examples using water. 저는 물이 있습니다 = i have water. as to 이게 물입니다 = this is water.
Another example to make u clearer is questioning and answering. example for 있습니다 Do you have money? =너는 돈이 있습니까? Yes I have money. = 네 돈이 있습니다.
Example for 입니다 What is that? = 저것은 무엇입니까? That is a Dog. = 저것은 개입니다.
Let me break it down. 1) Korean sentence structure is as follows. SUBJECT-OBJECT-VERB. The subject refers to the thing DOING the action. The object refers to what the verb is ACTING ON.
2) So for this sentence: The mountain is in the park It would be arranged as follows: The mountain - in the park - is
3) All you need to do is substitute the correct words into the sentence, with the correct KOREAN PARTICLES and CONJUGATION.
If you need an explanation for korean particles then I'd be happy to explain.