sseuregitong yeope meonjiga manhaseo meonjeo chiwoya hae.

There’s a lot of dust next to the trash can, so I have to clean that first.

Breakdown of sseuregitong yeope meonjiga manhaseo meonjeo chiwoya hae.

• ~가: subject particle
• ~에: location particle
• 많다: many
• 옆: side

Questions & Answers about sseuregitong yeope meonjiga manhaseo meonjeo chiwoya hae.

Why is 옆에 used here? Why not 옆에서?

옆에 marks a location: next to / beside.

So 쓰레기통 옆에 먼지가 많아서 means because there is a lot of dust next to the trash can.

If you used 옆에서, it would sound more like at the side of / beside it (as the place where an action happens). That particle is often used when something is being done at that location.

• 옆에 먼지가 많다 = There is a lot of dust next to it.
• 옆에서 청소하다 = Clean beside it / clean at that spot.

Here the sentence is describing where the dust is, so 옆에 is the natural choice.

Why is it 먼지가 많아서 and not 먼지를 많아서?

Because 많다 works like an adjective meaning to be many / to be a lot and the thing that is abundant takes the subject marker 이/가.

So:

• 먼지가 많다 = There is a lot of dust / Dust is plentiful

Using 먼지를 would be wrong here because 많다 does not take its noun as a direct object.

Compare:

• 사람이 많다 = There are many people
• 문제가 많다 = There are many problems
• 먼지가 많다 = There is a lot of dust

What does -아서 mean in 많아서?