jeoneun jeonyeokmada gongwoneseo sanchaekhaeyo.

저는 is 저 + 는.

• 저 = I / me in a humble, polite form
• 는 = the topic marker

So 저는 means something like As for me, ... or I ... in natural English.

The particle 는 marks 저 as the topic of the sentence. It does not always need to be translated directly, but it helps frame the sentence around me.

Both 저 and 나 mean I, but they are used at different politeness levels.

• 저 = humble/polite
• 나 = casual/plain

Since the verb ends in -해요, which is polite speech, 저 matches that level well.
Using 나 with -해요 can happen in conversation, but for learners, 저 + polite ending is the safest and most standard combination.

저녁마다 means every evening or each evening.

It is made of:

• 저녁 = evening
• 마다 = every, each

So 저녁마다 literally means at every evening or every evening.

This shows a repeated habit.

마다 is attached directly to a noun to mean every or each.

Examples:

• 날마다 = every day
• 주말마다 = every weekend
• 해마다 = every year
• 저녁마다 = every evening

It emphasizes repetition: something happens each time that period comes around.

Here, 에서 is used because the park is the place where the action happens.

• 에 often marks a destination or a static location
• 에서 marks the location where an action takes place

Since 산책해요 is an action, 공원에서 means in/at the park as the place where the walking happens.

Compare:

• 공원에 가요 = I go to the park
• 공원에서 산책해요 = I take a walk in the park

산책해요 comes from the verb 산책하다.

• 산책 = a walk, a stroll
• 하다 = to do

So 산책하다 literally means to do a walk, but naturally it means to take a walk or to go for a walk.

In polite present tense:

• 산책하다 → 산책해요

This is a very common noun + 하다 verb pattern in Korean.

Both can relate to walking, but they are not exactly the same.

• 산책하다 = to take a walk, to go for a stroll
• 걷다 / 걸어요 = to walk

산책해요 suggests walking as a leisure activity, often for exercise or relaxation.
걸어요 is more general and simply means walk.

So in this sentence, 산책해요 fits the idea of a regular evening stroll better.

-해요 shows that the sentence is in the polite present tense.

So 산책해요 means:

• I take a walk
• I go for a walk
• I am taking a walk
  depending on context

This is the standard polite style used in many everyday situations.

Yes, very often.

Korean frequently leaves out subjects when they are already clear from context. So you could simply say:

저녁마다 공원에서 산책해요.

This still naturally means I take a walk in the park every evening if the speaker is understood.

Including 저는 can make the sentence clearer, more complete for a learner, or add slight contrast/emphasis like As for me, ...

Yes. Korean word order is flexible as long as the particles stay correct.

For example, these are all possible:

• 저는 저녁마다 공원에서 산책해요.
• 저는 공원에서 저녁마다 산책해요.
• 저녁마다 저는 공원에서 산책해요.

The most neutral order is often time + place + verb, which is what you see here.

The verb usually comes at the end.

They are very similar, and in many cases both can be translated as every evening.

• 저녁마다 = every evening, each evening
• 매일 저녁 = every day in the evening / every evening

A small nuance:

• 마다 emphasizes each occurrence
• 매일 저녁 emphasizes daily evening time

In this sentence, either could work:

• 저는 저녁마다 공원에서 산책해요.
• 저는 매일 저녁 공원에서 산책해요.

Both sound natural.

Because 산책하다 does not need a direct object here.

The sentence has:

• a topic: 저는
• a time expression: 저녁마다
• a place of action: 공원에서
• a verb: 산책해요

Nothing in the sentence is being marked as a direct object.
This is normal for many verbs in Korean, especially action verbs like 산책하다.

A close breakdown is:

• 저는 = as for me / I
• 저녁마다 = every evening
• 공원에서 = at/in the park
• 산책해요 = take a walk

So very literally:

As for me, every evening, at the park, I take a walk.

Natural English would be:

I take a walk in the park every evening.