Osobiście wybieram ten kosztorys.

In Polish, the subject pronoun is often omitted because the verb ending already shows who is doing the action.

Here, wybieram means I choose / I am choosing, so ja is not necessary.

You could say Ja osobiście wybieram ten kosztorys, but that sounds more emphatic, like:

• I personally am choosing this estimate.
• As for me, I choose this one.

So the version without ja is very natural.

Osobiście is an adverb. In this sentence, it means personally.

It adds emphasis, showing that this is my own personal choice/opinion/decision.

Depending on context, osobiście can also mean in person, but here the most natural sense is personally.

For example:

• Osobiście się tym zajmę = I’ll handle it personally
• Spotkamy się osobiście = We’ll meet in person

So in your sentence, it is about personal preference or personal involvement, not physical presence.

Wybieram is:

• 1st person singular
• present tense
• from the verb wybierać = to choose / to select

So it literally means I choose or I am choosing.

Polish present tense can often match both English simple present and present continuous, depending on context.

So wybieram can mean:

• I choose
• I am choosing

These come from two different but related verbs:

• wybierać = imperfective
• wybrać = perfective

Wybieram is the present tense of the imperfective verb, so it can describe:

• an ongoing action
• a repeated action
• a general preference

Wybiorę is the future tense of the perfective verb wybrać, and it means something more like:

• I will choose
• I’ll make the choice

So:

• Osobiście wybieram ten kosztorys = a present choice, preference, or ongoing selection
• Osobiście wybiorę ten kosztorys = I will choose this estimate

Kosztorys is a masculine inanimate noun, so in the singular nominative it takes the demonstrative ten.

That is why you get:

• ten kosztorys = this cost estimate / this quotation / this estimate

The important thing is grammatical gender:

• masculine: ten
• feminine: ta
• neuter: to

Since kosztorys is masculine, ten is the correct form.

Because wybierać takes the accusative case, and for many masculine inanimate singular nouns, the accusative form is the same as the nominative form.

So:

• nominative: ten kosztorys
• accusative: ten kosztorys

That is why nothing changes visibly here.

Compare that with a masculine animate noun, where you would usually see a change:

• nominative: ten klient
• accusative: tego klienta

But with kosztorys as a masculine inanimate noun, nominative and accusative look the same.

It is in the accusative case, because it is the direct object of wybieram.

You are choosing what?
Answer: ten kosztorys

Even though the form looks the same as the nominative, its function in the sentence is accusative.

So grammatically:

• wybieram = verb
• ten kosztorys = direct object in the accusative

Kosztorys usually means a cost estimate, quotation, or estimate of costs.

The best English equivalent depends on context. It can be used for things like:

• construction work
• repairs
• projects
• services
• budgeting

So although you already know the sentence meaning, it is worth knowing that kosztorys is not just any document. It usually refers to a document listing expected costs.

Yes. Polish word order is fairly flexible, because endings often show the grammatical roles.

The neutral order here is:

• Osobiście wybieram ten kosztorys

But you could also say:

• Ten kosztorys wybieram osobiście
• Ten kosztorys osobiście wybieram
• Osobiście ten kosztorys wybieram

These versions are all possible, but the emphasis changes.

For example:

• Osobiście wybieram ten kosztorys puts early emphasis on personally
• Ten kosztorys wybieram osobiście highlights this estimate
• Ja osobiście wybieram ten kosztorys strongly emphasizes I

So Polish word order is not random, but it is more flexible than English.

Yes, you can absolutely say Wybieram ten kosztorys.

That simply means I choose / I’m choosing this estimate.

Adding osobiście gives extra emphasis, something like:

• Personally, I choose this estimate
• I personally choose this estimate

So osobiście is optional. It adds nuance rather than basic meaning.

A rough guide is:

o-so-BI-shche vy-BYE-ram ten kosh-TO-ris

A few useful pronunciation notes:

• ś/si before a vowel often sounds like a soft sh
• wy in wybieram is not like English wi; the y is a distinct Polish vowel
• sz sounds like English sh
• stress is usually on the second-to-last syllable

So the main stresses are:

• osoBIście
• wyBIEram
• koszTOrys

Usually less natural if there is no special reason to emphasize the subject.

Polish commonly drops subject pronouns, so:

• Osobiście wybieram ten kosztorys sounds natural
• Ja osobiście wybieram ten kosztorys sounds more emphatic

You would use ja if you want contrast, for example:

• Ty wybierasz inny, ale ja osobiście wybieram ten kosztorys
  You’re choosing a different one, but I personally am choosing this estimate

So ja is possible, but it adds emphasis rather than just filling a required slot.