gabangi mugeowoseo eokkaega apayo.

My shoulder hurts because the bag is heavy.

Breakdown of gabangi mugeowoseo eokkaega apayo.

• ~이: subject particle
• ~가: subject particle
• 가방: bag
• ~어서: because

Questions & Answers about gabangi mugeowoseo eokkaega apayo.

Why is -아서/어서 used in 무거워서?

-아서/어서 connects two clauses and often means because or so.

In this sentence:

• 가방이 무거워서 = because the bag is heavy
• 어깨가 아파요 = the shoulder(s) hurt

So 무거워서 shows the reason for the shoulder pain.

A very common pattern is:

• A-아서/어서 B
• Because A, B
• or A, so B

Here, the first part gives the cause, and the second part gives the result.

Why is it 무거워서 and not 무겁어서?

This is because 무겁다 is a ㅂ-irregular adjective.

When a ㅂ-irregular adjective is followed by a vowel, the ㅂ often changes to 우.

So:

• 무겁다 → 무거워요
• 무겁다 → 무거워서

That is why you get 무거워서, not 무겁어서.

A similar example:

• 덥다 → 더워요
• 춥다 → 추워요

But not every word with ㅂ is irregular, so this is something learners usually just memorize word by word.

Why does 가방 take 이?