Я виходжу з автобуса біля парку.

Виходжу is the 1st person singular present tense form of виходити.

So it literally means I go out / I am going out / I am getting out.

In this sentence, it is naturally understood as something like I am getting off / out of the bus. Ukrainian present tense can describe:

• an action happening now
• a habitual action
• sometimes a near-immediate action, depending on context

Because виходити is imperfective, виходжу is a true present-tense form.

With verbs meaning to leave, go out, get out, Ukrainian often uses з / із / зі + genitive to mean out of / from.

So:

• виходжу з автобуса = I get out of the bus / I get off the bus

This is a normal pattern:

• вийти з дому = to go out of the house
• вийти з кімнати = to leave the room
• виходити з машини = to get out of the car

Because з here requires the genitive case.

The dictionary form is автобус.
In the genitive singular, it becomes автобуса.

So:

• автобус = bus
• з автобуса = from the bus / out of the bus

This is a very common thing in Ukrainian: the noun changes form depending on its role in the sentence.

Because біля means near / by, and it also requires the genitive case.

So:

• парк = park
• біля парку = near the park

This is another case-governing preposition, just like з in this sentence.

Both nouns after the prepositions are in the genitive singular:

• з автобуса → genitive after з
• біля парку → genitive after біля

So the structure is:

• Я = I
• виходжу = am getting out / get out
• з автобуса = from the bus
• біля парку = near the park

Yes. Very often, Ukrainian drops subject pronouns when they are clear from the verb form.

So both are possible:

• Я виходжу з автобуса біля парку.
• Виходжу з автобуса біля парку.

The ending -у in виходжу already shows that the subject is I.

Using Я can add:

• emphasis
• contrast
• clarity

For example, Я виходжу, not він.

No, Ukrainian word order is fairly flexible.

The sentence Я виходжу з автобуса біля парку is a neutral, natural order.

But other orders are possible, for example:

• Біля парку я виходжу з автобуса.
• З автобуса я виходжу біля парку.

These versions shift the emphasis:

• starting with біля парку highlights the location
• starting with з автобуса highlights what you are getting out of

So word order in Ukrainian often affects focus more than basic grammar.

They all basically mean the same thing here: from / out of.

The choice between з, із, and зі is usually about pronunciation and sound flow, not meaning.

So you may hear:

• з автобуса
• із автобуса

Both are possible. Speakers choose the form that sounds smoother in context.

Very roughly:

• з is the basic form
• із and зі are often used to avoid awkward consonant clusters

This is about aspect.

• виходжу comes from виходити → imperfective
• вийду comes from вийти → perfective

Difference:

• виходжу = I am getting out / I get out
• вийду = I will get out / I will leave

So if you want a present-time meaning, виходжу is correct.

Examples:

• Я виходжу з автобуса зараз. = I am getting off the bus now.
• Я вийду з автобуса біля парку. = I will get off the bus near the park.

Because Ukrainian does not have articles like a and the.

So автобуса can mean:

• the bus
• a bus

And парку can mean:

• the park
• a park

The exact meaning depends on context.

In many real situations, English would naturally translate this as the bus and the park, but Ukrainian does not need separate article words to say that.