Kiviyi soyup yoğurdun içine koydum.

Because kivi is the direct object of the verb soymak (to peel), and in Turkish a specific/definite direct object usually takes the accusative ending.

• kivi = kiwi
• kiviyi = the kiwi / a specific kiwi

The extra y is a buffer consonant. Turkish often inserts y when a vowel-initial suffix is added to a word that already ends in a vowel.

So:

• kivi + -i would be awkward
• Turkish makes it kivi + y + i = kiviyi

Soyup comes from the verb soymak, which means to peel in this context.

The form -up / -ip / -ıp / -üp is a very common Turkish connector meaning something like:

• having done ...
• ... and then ...
• sometimes just ... and ...

So kiviyi soyup yoğurdun içine koydum means roughly:

• I peeled the kiwi and put it into the yogurt
• or more literally: Having peeled the kiwi, I put it into the yogurt

Because Turkish often links two actions with the -ip/-ıp/-up/-üp form instead of using two fully conjugated verbs.

Compare:

• Kiviyi soyup yoğurdun içine koydum.
  = I peeled the kiwi and put it into the yogurt.

• Kiviyi soydum ve yoğurdun içine koydum.
  = I peeled the kiwi and I put it into the yogurt.

Both are correct, but soyup sounds more natural and compact here.

A useful rule: When the same subject does both actions, Turkish often uses this connector form.

Because of vowel harmony.

The connector has four possible forms:

• -ıp
• -ip
• -up
• -üp

Which one you use depends on the last vowel of the verb stem.

The stem here is soy-. Its last vowel is o, so the correct form is -up:

• soy + up = soyup

Other examples:

• gelip = coming and...
• alıp = taking and...
• görüp = seeing and...

Yoğurdun içine means into the inside of the yogurt.

It is built like this:

• yoğurt = yogurt
• yoğurdun = of the yogurt
• içi = its inside / the inside
• içine = into its inside

So:

• yoğurdun içine = into the yogurt / more literally into the inside of the yogurt

You can sometimes say yoğurda koydum (I put it in/into the yogurt), but yoğurdun içine is more explicit and often more natural when emphasizing that something goes inside something.

This is because of two things:

1. The genitive ending

To say of the yogurt, Turkish adds the genitive ending:

• yoğurt → yoğurdun

2. Consonant softening

The final t in yoğurt changes to d before a vowel-initial ending in many situations:

• yoğurt
• yoğurdun

This is a common pattern in Turkish:

• kitap → kitabın
• ağaç → ağacın
• yoğurt → yoğurdun

İçine can be broken down into parts:

• iç = inside
• içi = its inside / the inside
• içine = into its inside

In this sentence, yoğurdun içine is a common Turkish structure meaning into the yogurt.

You will see similar patterns a lot:

• kutunun içine = into the box
• çantanın içine = into the bag
• odanın içine = into the room / into the inside of the room

So this is a very useful pattern to learn.

Koydum is in the simple past tense and means I put.

Breakdown:

• koy- = put
• -du- = past tense
• -m = I

So:

• koydum = I put

Because of vowel harmony and consonant assimilation, the past ending can appear in different forms:

• -dı
• -di
• -du
• -dü
• or -tı/-ti/-tu/-tü

Here it is -du because that matches the verb phonologically.

Turkish often drops subject pronouns when they are already clear from the verb ending.

Here, koydum already tells you the subject is I because of the ending -m.

So:

• Ben kiviyi soyup yoğurdun içine koydum. = correct
• Kiviyi soyup yoğurdun içine koydum. = also correct, and more natural unless you want emphasis

Turkish does this very often.

Yes. In this sentence, it strongly suggests:

1. I peeled the kiwi
2. Then I put it into the yogurt

The -up form often gives that kind of natural sequence.

So this sentence does not normally mean that both actions happened at exactly the same time. It is understood as one action followed by the next.

Yes, Turkish word order is flexible, but the original sentence is very natural.

Original:

• Kiviyi soyup yoğurdun içine koydum.

Other possible orders include:

• Yoğurdun içine kiviyi soyup koydum.
• Kiviyi yoğurdun içine soyup koydum.

But these can sound more marked or emphasize different parts. The original version is probably the clearest and most neutral for everyday use.

A helpful general idea: Turkish often puts the main verb at the end, which is exactly what happens here with koydum.

Yes. In sentences like this, the -ip/-ıp/-up/-üp form normally implies that the subject is the same as the subject of the main verb.

So here, the person who peeled the kiwi is also the person who put it into the yogurt.

That is why English often translates it with the same subject:

• I peeled the kiwi and put it into the yogurt.

If the subjects were different, Turkish would usually need a different structure.

In yoğurt, the ğ usually does not sound like a strong consonant in the way an English speaker might expect.

Very roughly:

• yoğurt sounds something like yo-urt or with a slight lengthening/smoothing of the vowel

The ğ often:

• lengthens the preceding vowel,
• creates a glide,
• or is barely pronounced on its own.

So yoğurdun is not pronounced with a hard g sound.

This letter can take practice, but learners usually get used to it by hearing a lot of examples.

Yes, kivi is the standard Turkish spelling.

Turkish spelling usually matches Turkish pronunciation more closely than English does, so many borrowed words are written in a more phonetic Turkish way.

So:

• English: kiwi
• Turkish: kivi

That is completely normal in Turkish vocabulary.