oneureun chuwoseo mokdorireul haeyo.

Today it’s cold, so I wear a scarf.

Breakdown of oneureun chuwoseo mokdorireul haeyo.

• ~를: object particle
• ~은: topic particle
• 오늘: today
• 춥다: cold

Questions & Answers about oneureun chuwoseo mokdorireul haeyo.

Why is 은 used in 오늘은 instead of 이/가?

은 is the topic marker. In 오늘은, it means something like as for today or today, at least.

So 오늘은 추워서 목도리를 해요 has a nuance like:

• As for today, it’s cold, so I wear a scarf
• Today, since it’s cold, I’m wearing a scarf

Using 은 can also suggest a slight contrast, even if it is very mild:

• Today is cold
• maybe other days are not

If you used 오늘이, it would sound more like today is the grammatical subject, which is less natural here.

What does -아서/어서 mean in 추워서?

-아서/어서 connects two parts of a sentence and often means because or so.

Here:

• 추워서 = because it is cold / since it is cold
• 목도리를 해요 = I wear a scarf

So the sentence structure is:

• 오늘은 추워서 = Because it’s cold today
• 목도리를 해요 = I wear a scarf

This grammar is commonly used when one situation naturally leads to another.

Why does 춥다 become 추워서?