Expression dictionary — full article
Reasons & Causes · because it is..., since it is...
The V+(이)라서 expression, specifically the (이)라서 part, is a connective ending used to indicate that the preceding noun is the direct reason or cause for the following clause. It conveys the nuance of "because it is [noun]" or "since it is [noun]". While the expression format includes V+, (이)라서 directly attaches to nouns, not verbs. If a verb needs to be the reason, it must first be nominalized (e.g., V-는 것 + 이라서).
This ending is employed when the identity, status, or nature of a noun is the fundamental reason for a particular situation or action.
(이)라서 when you want to explicitly state that "being X" is the cause. For example, "학생이라서" (because I am a student) implies that my student status is the direct reason for something.N + 이기 때문에 but carries a similar meaning.The (이)라서 form attaches directly to nouns:
아니다 (to not be), it becomes 아니라서.
N + (이)라서 expresses a reason based on a noun's identity, A/V + 아서/어서 and A/V + (으)니까 are used for general reasons involving adjectives and verbs. (이)라서 specifically highlights the noun's state of being as the cause.(이)라서 is commonly used in everyday conversation. For more formal or written contexts, N + 이기 때문에 can be used interchangeably, though 이기 때문에 might sound slightly more emphatic or explanatory.N + 이었/였 + 어서 or N + 이었/였 + 기 때문에 rather than directly attaching (이)라서 to a past-tense noun form. For example, "어제는 휴일이었어서" (because yesterday was a holiday) or "어제는 휴일이었기 때문에".