haesbichi ganghaeseo ppallaega geumbang mallayo.

• 햇빛이 = sunlight
  • subject marker 이
• 강해서 = is strong
  • because/so
• 빨래가 = laundry / clothes being dried
  • subject marker 가
• 금방 = quickly / in no time
• 말라요 = dries / gets dry

A very literal English order is: Because the sunlight is strong, the laundry dries quickly.

Here, -해서 connects the first clause to the second and gives a reason or cause.

So:

• 햇빛이 강해서 = because the sunlight is strong
• 빨래가 금방 말라요 = the laundry dries quickly

In natural English, it can sound like either because or so, depending on how you translate it.

The dictionary form is 강하다 (to be strong).

With many 하다 verbs and adjectives, forms that would historically be 하여 or 하여서 are usually contracted:

• 강하다 + 여서 / 아서 → 강하여서
• 강하여서 → 강해서

So 강해서 is the normal, natural form.

Because the sentence has two clauses, and each clause has its own subject:

• 햇빛이 강해서 = the sunlight is strong
• 빨래가 금방 말라요 = the laundry dries quickly

So 햇빛이 is the subject of the first clause, and 빨래가 is the subject of the second clause.

This is very normal in Korean.

Because 말라요 comes from 마르다, which means to become dry / to get dry. That verb is intransitive, so the laundry is the subject of the drying, not the object.

So:

• 빨래가 말라요 = The laundry dries / gets dry

If you wanted to say to dry something, you would usually use 말리다:

• 빨래를 말려요 = dry the laundry

So 가 is correct here.

빨래 often means laundry, and depending on context it can refer to:

• the act of doing laundry
• the clothes being washed
• the washed clothes being dried

In this sentence, it means the laundry / the clothes.

So 빨래가 금방 말라요 means the clothes dry quickly, not that the act of washing happens quickly.

In this sentence, 금방 means quickly, soon, or in no time.

So:

• 빨래가 금방 말라요 = The laundry dries quickly / in no time

A useful thing to know is that 금방 can also mean just a moment ago in other contexts, so its exact meaning depends on the sentence.

This is because 마르다 is a 르 irregular verb.

When it conjugates before endings like -아요, the 르 changes and an extra ㄹ appears:

• 마르다 → 말라요

So:

• 마르다 = to become dry
• 말라요 = it dries / gets dry

This is the same pattern you see in words like:

• 모르다 → 몰라요
• 자르다 → 잘라요

Yes, they are different.

• 말라요 comes from 마르다 = to become dry
• 말아요 usually comes from 말다 and can mean things like stop or appear in expressions such as 하지 말아요 = please don’t do it

So even though they look similar, they are different words.

Also, the pronunciation is different:

• 말라요 ≈ mal-la-yo
• 말아요 ≈ ma-ra-yo

This is an important pair:

• 마르다 = to dry / to become dry
  
  • 빨래가 말라요 = The laundry dries
• 말리다 = to dry something
  
  • 빨래를 말려요 = I dry the laundry / dry the clothes

So in your sentence, the laundry is simply becoming dry, which is why 마르다 is used.

Yes, 햇빛이 강하다 is natural. It means the sunlight is strong/intense.

A related word is 햇볕, which often feels more like sunshine or the sun’s rays/heat. In daily Korean, both can appear in similar situations, but the nuance is a little different:

• 햇빛 = sunlight, light from the sun
• 햇볕 = sunshine, sunny warmth/rays

For laundry, you might also hear things like:

• 햇볕이 좋아서 빨래가 잘 말라요 = The sunshine is good, so the laundry dries well

So the original sentence is natural, and 햇볕 is just a nearby word with a slightly different feel.

Yes, it is in the present polite form, but Korean present tense often covers more than simple present English.

It can describe:

• a general fact
• a habitual result
• something expected to happen soon

So this sentence can mean either:

• Laundry dries quickly when the sunlight is strong
• The laundry will dry quickly because the sun is strong

The exact feeling depends on context.