Я хочу перейти дорогу.

Because дорогу is in the accusative case.

The verb перейти means to cross, and the thing being crossed is the direct object. In Ukrainian, direct objects often take the accusative case.

• dictionary form: дорога = road
• accusative singular: дорогу

So:

• Я хочу перейти дорогу. = I want to cross the road.

Перейти is the normal verb meaning to cross / to go across / to pass over.

In this sentence, it means crossing from one side of the road to the other.

The form перейтися is a different verb pattern and would not fit this meaning here. For crossing a road, перейти дорогу is the standard expression.

Хочу means I want.

It comes from the verb хотіти = to want.

So the sentence breaks down like this:

• Я = I
• хочу = want
• перейти = to cross
• дорогу = the road

Literally: I want to cross the road.

Because after хочу (I want), Ukrainian usually uses an infinitive, just like English uses to + verb.

Compare:

• Я хочу спати. = I want to sleep.
• Я хочу їсти. = I want to eat.
• Я хочу перейти дорогу. = I want to cross the road.

So перейти is the infinitive: to cross.

Yes, it can often be omitted.

Ukrainian verbs usually show the person clearly, and хочу already means I want, so Я хочу перейти дорогу and Хочу перейти дорогу can both work.

Including Я can:

• make the subject clearer
• add emphasis
• sound slightly more explicit

So both are possible:

• Я хочу перейти дорогу.
• Хочу перейти дорогу.

Перейти is perfective.

That means it presents the action as a completed whole: crossing from one side to the other.

Its imperfective partner is usually переходити = to be crossing / to cross habitually / to cross in general.

Why this matters:

• Я хочу перейти дорогу. = I want to cross the road.
  Focus: one complete crossing.

If you used the imperfective, it would sound less natural in this exact situation unless you meant something more general or repeated.

For a single intended completed action, перейти is the normal choice.

It most naturally means road here, but in many real situations English might translate it as street.

So depending on context:

• Я хочу перейти дорогу. = I want to cross the road.
• also possible in natural English: I want to cross the street.

Ukrainian дорога is a broad word for road/way, and translation depends on the situation.

No, Ukrainian word order is fairly flexible, though some orders sound more neutral than others.

The most neutral version here is:

• Я хочу перейти дорогу.

You may also hear different orders for emphasis, for example:

• Дорогу я хочу перейти.
  Emphasis on the road
• Перейти дорогу я хочу.
  Emphasis on crossing

But for learners, the normal and safest order is:

• Я хочу перейти дорогу.

A simple approximate pronunciation is:

Ya kho-CHU pe-rey-TY do-RO-hu

A few notes:

• Я sounds like ya
• х is like the ch in Scottish loch or German Bach
• хочу has stress on the last syllable: хоЧУ
• перейти has stress on the last syllable: перейТИ
• дорогу has stress on the middle syllable: доРОгу
• Ukrainian г is usually pronounced like a softer h sound, so дорогу is closer to dorohu than dorogu

Because Ukrainian does not need a separate word like English to before an infinitive.

English says:

• I want to cross

Ukrainian says:

• Я хочу перейти

The infinitive ending itself already shows that the verb is in the to cross form.

So перейти already means to cross.

Yes, you can.

Перетнути дорогу also means to cross the road. It is a correct and common alternative.

Very roughly:

• перейти дорогу = to go across the road
• перетнути дорогу = to cross the road

In many contexts they are interchangeable. For a learner, перейти дорогу is very natural and useful.

Usually it means the literal physical action: to cross the road.

However, expressions with перейти дорогу can sometimes be used figuratively in some contexts, similar to get in someone’s way or cross someone. But that would usually involve a different structure, often with a person:

• перейти комусь дорогу = to stand in someone’s way / to thwart someone

Your sentence:

• Я хочу перейти дорогу

will normally be understood literally: I want to cross the road.