Q)

Hi everyone!
I would appreciate if someone could make it clear for me since Google is not helping.
So in Korean there is "끝났어요" which means "be over" or "come to end". If "끝" is the "end" then "났어요" should be some kind of a verb with meaning "come" but what is the actual dictionary form of this verb? ^^;;

A)

Simply, '끝' is a noun, '끝나다' is a verb. In Korean, there are 2 types of speaking. One is talking to elders, another is talking to friends or youngers. '끝났어요' is for elders. '끝났어' is for friends or youngers. It will be better that you think '끝났어요' is a one word. You don't have to separate it.

Q)
Also, I often hear in movies "우리 끝나서" which couples say while breaking up so when else can this phrase be used? Should there be any specific context or situation or I can say it whenever something is done/over?

A)

'우리 끝나서' means the relationship between couples is broken. If that phrase is a one sentence, it should be corrected by '우리 끝났어.' In this situation, '끝났어' can be altered by '깨졌어.'-'우리 깨졌어.'

'끝나다' can be used in case by case but original meaning is end/over, you can use it when you want to say a word whose meaning is ending.

I hope my correction help you to improve your Korean skills^^