yangchihago naseo baro jayo.

양치 literally refers to brushing one’s teeth. By itself, it is basically a noun, and the full dictionary verb is 양치하다 = to brush one’s teeth.

So in this sentence:

• 양치하고 = brush one’s teeth and / after brushing one’s teeth

Korean often makes verbs by combining a noun with 하다.

Because the verb is 양치하다, and when 하다 connects to -고, it becomes 하고.

So:

• 양치하다
  • -고 → 양치하고

This is a very common pattern:

• 공부하다 → 공부하고
• 운동하다 → 운동하고
• 청소하다 → 청소하고

So 양치하고 is the normal connected form of 양치하다.

-고 나서 means after doing something.

So:

• 양치하고 나서 = after brushing one’s teeth

This pattern emphasizes that the first action happens first, and then the next action happens afterward.

In this sentence:

• 양치하고 나서 바로 자요
• After brushing my/your/their teeth, [they] go straight to sleep

Compared with just -고, -고 나서 more clearly highlights the sequence: first A, then B.

Yes, you could, and it would still sound natural in many situations.

• 양치하고 바로 자요 = I brush my teeth and go straight to bed
• 양치하고 나서 바로 자요 = After brushing my teeth, I go straight to bed

The version with 나서 makes the after that relationship more explicit. It feels a little clearer about the order of actions.

So:

• -고 = simple linking, often and
• -고 나서 = specifically after doing

바로 means right away, immediately, or directly.

So:

• 바로 자요 = go to sleep right away

In this sentence, it suggests there is no delay between brushing teeth and going to bed.

Examples:

• 집에 가서 바로 잤어요. = I went home and slept right away.
• 수업 끝나고 바로 왔어요. = I came right after class ended.

Yes, 자요 is the polite non-past form of 자다 (to sleep).

In Korean, the non-past form can express:

• present habitual action
• near future
• general facts

So 자요 here can mean things like:

• I go to bed right after brushing my teeth (habit)
• I’m going to sleep right after brushing my teeth (future/intention, depending on context)

Korean often uses the same form where English would choose either present or future.

The subject is omitted. This is extremely common in Korean.

So 양치하고 나서 바로 자요 could mean:

• I go to bed right after brushing my teeth
• He/She goes to bed right after brushing his/her teeth
• We/They go to bed right after brushing our/their teeth
• even You go to bed right after brushing your teeth, depending on context

Korean often leaves out subjects when they are already understood from the situation.

Because 양치하다 already means to brush one’s teeth, so the idea of teeth is built into the word.

You can also say:

• 이를 닦고 나서 바로 자요

This is also natural and literally means after brushing my teeth, I go straight to bed.

The difference is roughly:

• 양치하다 = a set phrase meaning to brush one’s teeth
• 이를 닦다 = more literally to brush the teeth

Both are common.

자요 is in the polite informal style, often called 해요체.

It is polite and very common in everyday Korean.

Related forms:

• 자 = casual/intimate
• 자요 = polite everyday speech
• 잡니다 = formal polite

So the full sentence could appear in different styles:

• 양치하고 나서 바로 자.
• 양치하고 나서 바로 자요.
• 양치하고 나서 바로 잡니다.

The meaning stays basically the same, but the politeness/formality changes.

The Korean word order is roughly:

• 양치하고 나서 = after brushing teeth
• 바로 = right away
• 자요 = sleep / go to bed

So very literally:

• After brushing teeth, immediately sleep

Natural English would be:

• I go to bed right after brushing my teeth.
• After brushing my teeth, I go straight to bed.

Korean usually puts time/order expressions before the final verb.

The basic meaning of 자다 is to sleep. But in many everyday contexts, especially with words like 바로, English may translate it more naturally as go to bed.

So:

• 바로 자요 could literally be sleep right away
• but natural English is often go to bed right away

The exact translation depends on context. In this sentence, because it comes after brushing teeth, go to bed right away sounds very natural.