achimeneun chuwoseo koteureul ipgo nagasseoyo.

아침에 simply means in the morning.

When 는 is added, it becomes 아침에는, which adds a topic or contrast nuance:

• as for the morning
• in the morning, at least
• in the morning though...

So 아침에는 추워서 can sound like:

• It was cold in the morning
• possibly implying but later it wasn’t

Sometimes that contrast is strong, and sometimes it is just a natural topic marker.

추워서 is 춥다 + -어서.

Here, -아서/어서 means:

• because
• so
• sometimes and then, depending on context

In this sentence, it clearly gives a reason:

• 추워서 = because it was cold / since it was cold

So the structure is:

• 아침에는 추워서 = because it was cold in the morning

This is because 춥다 is a ㅂ-irregular adjective.

The basic pattern is:

• 춥다
• remove 다 → 춥
• before a vowel-starting ending like -어서, the ㅂ changes to 우
• 추우 + 어서
• this contracts to 추워서

So:

• 춥다 → 추워요
• 춥다 → 추워서

This same pattern happens with other ㅂ-irregular words, such as:

• 덥다 → 더워요
• 어렵다 → 어려워요

In Korean, when clauses are connected, the tense is often shown only in the final verb.

So even though 추워서 looks like a non-past form, the whole sentence is understood as past because the final verb is past:

• 나갔어요 = went out

That makes the whole sentence naturally understood as:

• It was cold, so I went out wearing a coat

With -아서/어서, the first clause usually does not take its own past tense marking in normal usage.

코트 is the Korean word for coat.

The -를 is the object marker:

• 코트를 입다 = to wear a coat / to put on a coat

Because 코트 ends in a vowel sound, it takes -를 rather than -을.

So:

• 코트를 = a coat as the direct object of 입다

입고 is from 입다 + -고.

The ending -고 connects verbs and often means:

• and
• and then
• while

So:

• 코트를 입고 나갔어요 literally means put on/wear a coat and went out

In natural English, this is often translated as:

• I put on a coat and went out
• I went out wearing a coat

It can suggest both, depending on context.

Literally, it is a sequence:

• put on a coat and went out

But in natural usage, Korean often uses this pattern to describe the state that continues into the next action. So it can also feel like:

• went out wearing a coat

In this sentence, both English translations are reasonable.

나가다 means to go out, while 가다 just means to go.

So:

• 나갔어요 = went out
• 갔어요 = went

Because the sentence is about leaving an inside place, such as home or a building, 나가다 is more precise.

This is very common in Korean.

In connected sentences, earlier verbs often appear in a linking form, and the final verb carries the main tense and speech level.

Here:

• 추워서 = linking form
• 입고 = linking form
• 나갔어요 = final verb, showing both past tense and politeness

So Korean does not need to mark every verb separately the way English sometimes does.

나갔어요 is in the polite casual style, often called the -아요/어요 style.

It is:

• polite
• natural in everyday conversation
• less formal than 나갔습니다
• more polite than plain casual 나갔어

So this sentence sounds like normal, polite spoken Korean.

Korean often leaves out the subject when it is already understood from context.

So this sentence does not explicitly say:

• I
• he
• she
• they

But in many real situations, listeners can infer it easily. If someone is talking about their own morning, the understood subject is usually I.

This is very normal in Korean and happens all the time.