-(으)ㄴ/는 만큼

-(으)ㄴ/는 만큼 links two things in equal measure ("as much as") or gives a known fact as grounds for what should follow ("since / given that").

이유·원인Reason & cause

Han: 비싸다 is an adjective, so it takes -(으)ㄴ 만큼; the present form 는 만큼 is only for verbs.

Examples

이 가방은 비싼 만큼 품질도 좋아요.This bag is expensive, but the quality is as good as the price.

노력한 만큼 좋은 결과가 있을 거예요.You'll get results that match the effort you put in.

드시고 싶은 만큼 드세요.Please have as much as you'd like.

오늘은 중요한 날인 만큼 일찍 출발합시다.Since today is an important day, let's leave early.

-(으)ㄴ/는 만큼vs-(으)ㄹ 만큼-(으)ㄹ 만큼 describes an extent ("so much that…"), not a matching amount or a reason: 눈물이 날 만큼 감동적이었어요.

V+(으)ㄴ 만큼 (past)

V+는 만큼 (present)

A+(으)ㄴ 만큼

N+인 만큼

노력하다 → 노력한 만큼, 먹다 → 먹는 만큼, 비싸다 → 비싼 만큼, 날이다 → 날인 만큼

Verbs take 는 (present) or (으)ㄴ (past); adjectives take only (으)ㄴ, and nouns need 인: 중요한 날인 만큼, not 중요한 날 만큼.
In the "since" meaning, the second clause is usually a suggestion, request, obligation or judgment (-읍시다, -으세요, -아야 해요), which -아서 cannot take.
After a modifier, 만큼 is a separate noun and is written with a space (노력한 만큼); directly after a noun it is a particle and is attached (나만큼).

Wrong: ~~이 가방은 비싸는 만큼 품질도 좋아요.~~

Right: 이 가방은 비싼 만큼 품질도 좋아요.

비싸다 is an adjective, so it takes -(으)ㄴ 만큼; the present form 는 만큼 is only for verbs.

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