"저는 안경을 찾아요(=찾고 있어요)" can emphasize "안경" while "제가" is stressed in the second one.^^/ A : WHAT are you doing? or WHAT are you looking for? B : 저는 안경을 찾아요.(=찾고 있어요) = I am looking for THE GLASSES.(not other things) A: WHAT did you find? or Did you find the glasses? B : 저는 안경을 찾았어요. = I found the glasses. (In both examples above, "저는" can be left out becuase "WHO" isn't important) A : WHO found the glasses? B : I did. = 제가 안경을 찾았어요.(not other persons) \^o^/

저는 means I So, 저는 안경을 찾아요. - I find my glasses. 제가 means mine So, 제가 안경을 찾았어요. - Found my glasses I hope im right. Im learning too.