Ben bazen ayran yerine mandalina suyu istiyorum, ama börekle ayran daha iyi oluyor.

Ben is not strictly necessary. Turkish verbs already show the person, and istiyorum already means I want.

So these are both natural:

• Ben bazen ... istiyorum.
• Bazen ... istiyorum.

Adding Ben gives a little more emphasis, as if the speaker is highlighting I or speaking more personally.

Yes, bazen can move. Turkish adverbs are fairly flexible.

In this sentence, Ben bazen ayran yerine mandalina suyu istiyorum is a neutral, natural order.

You could also hear:

• Bazen ben ayran yerine mandalina suyu istiyorum.
• Ben ayran yerine bazen mandalina suyu istiyorum.

But the emphasis shifts slightly depending on where bazen appears. The version in your sentence is one of the most natural everyday placements.

yerine means instead of or in place of.

So:

• ayran yerine mandalina suyu = mandarin juice instead of ayran

A very common pattern is:

• X yerine Y = Y instead of X

Examples:

• çay yerine kahve = coffee instead of tea
• ekmek yerine pilav = rice instead of bread

With nouns, Turkish often uses the bare form before yerine. With pronouns, you usually get forms like:

• benim yerime = instead of me
• senin yerine = instead of you

Because this is a Turkish noun compound.

When one noun modifies another noun, the second noun usually takes a compound ending. So:

• elma suyu = apple juice
• portakal suyu = orange juice
• mandalina suyu = mandarin juice

Here, mandalina describes what kind of su it is. The second word, su, appears in the compound form suyu.

So this is not random vocabulary memorization; it follows a common Turkish pattern.

Because it is being used as an indefinite object.

In Turkish, a direct object often stays in the bare form when it means a / some / an unspecified one:

• mandalina suyu istiyorum = I want mandarin juice / some mandarin juice

If it were specific, you would usually use the accusative:

• mandalina suyunu istiyorum = I want the mandarin juice

So the bare form here sounds natural because the speaker is expressing a general preference, not asking for one specific juice already identified.

Yes, istiyorum literally means I want, from istemek = to want.

In Turkish, this is very normal in everyday situations, including food and drink. It does not automatically sound rude or overly strong the way I want sometimes can in English.

Depending on context, istiyorum can mean:

• I want
• I’d like
• I’m ordering

So in a sentence about food preferences, it sounds completely natural.

Because Turkish normally places the verb at the end of the clause.

That is one of the biggest structural differences from English.

So:

• mandalina suyu istiyorum
  literally: mandarin juice I-want

• ayran daha iyi oluyor
  literally: ayran better becomes/is

Turkish word order is often described as subject-object-verb, though in real life it can be flexible for emphasis. Still, final-position verbs are the default pattern.

börekle means with börek.

It is formed from:

• börek
• ile = with

In everyday Turkish, ile is very often attached to the noun as -le / -la:

• börek ile → börekle
• çay ile → çayla
• arkadaş ile → arkadaşla

So börekle ayran means ayran with börek.

It is repeated for clarity and contrast.

The sentence is making a comparison:

• sometimes the speaker wants mandalina suyu
• but with börek, ayran is better

Repeating ayran makes that contrast very clear. Turkish often repeats nouns in places where English might prefer a pronoun or leave something implied.

So the repetition sounds natural, not clumsy.

daha iyi means better, but oluyor adds the idea of it turns out / it is / it works out / it goes better.

So börekle ayran daha iyi oluyor is not just a dry comparison. It has a natural everyday sense like:

• ayran is better with börek
• ayran goes better with börek
• ayran works better with börek

In colloquial Turkish, olmak is often used this way to describe how something feels, turns out, or suits a situation.

This is a very common point for English speakers.

In Turkish, the -yor form does not only mean something happening right now. It can also be used for:

• present actions
• habitual situations
• general statements in context

So oluyor here can mean something like:

• is
• tends to be
• works out as

English separates is happening and usually happens more sharply than Turkish does. Turkish often lets context do that job.

Literally, daha iyi means better:

• iyi = good
• daha iyi = better

But in this sentence, it really means a better match or a better choice.

So börekle ayran daha iyi oluyor does not only mean ayran is better in some abstract sense. It means that, when eating börek, ayran is the better drink choice.