Ben dereotunu yoğurda karıştırmadan edemiyorum.

This is a very common Turkish pattern:

verb + -madan/-meden + edememek

It means:

• to be unable to refrain from doing something
• to be unable to help doing something
• to not be able to resist doing something

So karıştırmadan edemiyorum does not mean simply I can’t do without mixing in a literal English way. Idiomatically, it means:

• I can’t help mixing
• I can’t resist mixing

In this sentence, the full idea is:

I can’t help mixing dill into yogurt.

Yes, it contains two negative-looking parts:

• karıştırmadan = without mixing
• edemiyorum = I cannot do

But together they form a fixed expression in Turkish: -madan edememek.

So instead of canceling each other out, they create the meaning:

cannot help doing something

A useful way to feel the logic is:

• karıştırmadan edemiyorum
• literally: I cannot do without mixing
• natural English: I can’t help mixing

So even though the form looks negative, the overall meaning is that the speaker ends up doing the action.

It breaks down like this:

• karıştır- = to mix
• -ma- = negative marker
• -dan = without / from in this converb pattern

So:

• karıştırmadan = without mixing

This -madan/-meden form is often called a converb or adverbial verb form. It links one action to another, often with the meaning without doing X.

Examples:

• bakmadan = without looking
• sormadan = without asking
• düşünmeden = without thinking

In this sentence, though, it is part of the idiom -madan edememek.

It comes from the verb etmek (to do), but here it is part of the idiom.

Breakdown:

• et- = do
• -e- = ability marker in negative construction
• -me- = negation
• -yor = present continuous
• -um = I

So:

• edemiyorum = I cannot do / I am unable to do

You may notice that etmek becomes ed- here. That is normal sound change:

• etmek → edemiyorum

Similar examples:

• gidemiyorum = I can’t go
• yapamıyorum = I can’t do/make
• edemiyorum = I can’t do

Because dereotunu is the definite direct object of the verb karıştırmak.

Turkish often marks a specific direct object with the accusative ending. Here the speaker is talking about the dill as the thing being mixed.

So:

• dereotu = dill
• dereotunu = the dill / dill as the specific object being mixed

In this sentence, dill is what gets mixed, so it is the direct object.

A rough comparison:

• elma yiyorum = I’m eating apple / apples
• elmayı yiyorum = I’m eating the apple

Here:

• dereotunu ... karıştırmak = to mix the dill ...

This is a great question, because dereotu is not just a simple noun in form. It is a compound noun:

• dere
  • otu

Words like this behave like compound nouns ending in a possessive-type form, so when you add a case ending, Turkish often inserts a buffer n.

So:

• dereotu = dill
• dereotunu = dill + accusative

That n is not random. It is a normal linking consonant used with this type of noun.

You can compare:

• otobüs durağı → otobüs durağını
• yemek masası → yemek masasını
• dereotu → dereotunu

So dereotunu is the expected form.

Because yoğurt is the place/target that the dill is being mixed into, and Turkish marks that with the dative ending:

• yoğurt = yogurt
• yoğurda = into/to the yogurt

With karıştırmak, Turkish often works like this:

• the thing being mixed = direct object
• the thing it is mixed into = dative

So:

• dereotunu yoğurda karıştırmak
• literally: to mix the dill into the yogurt

This is very natural Turkish.

Because yoğurtla would suggest with yogurt, not into yogurt.

Compare the cases:

• yoğurda = into the yogurt / to the yogurt
• yoğurtla = with yogurt

In this sentence, the yogurt is the destination or container of the mixing, so yoğurda is the right choice.

English often says mix X with Y or mix X into Y, but Turkish chooses case endings more precisely here.

So:

• dereotunu yoğurda karıştırmak = mix the dill into the yogurt

No, it is not strictly necessary.

Because edemiyorum already means I cannot, the subject I is already clear from the verb ending -um.

So Turkish could simply say:

Dereotunu yoğurda karıştırmadan edemiyorum.

That would still mean the same thing.

Adding Ben can do things like:

• add emphasis
• create contrast
• make the speaker more explicit

For example, it can sound like:

• As for me, I can’t help mixing dill into yogurt.

So Ben is grammatical, but optional.

The sentence is:

Ben dereotunu yoğurda karıştırmadan edemiyorum.

A rough structure is:

• Ben = subject
• dereotunu = direct object
• yoğurda = dative complement
• karıştırmadan = adverbial verb form
• edemiyorum = main verb

Turkish usually puts the main verb at the end, and that is exactly what happens here.

So the sentence follows a very normal Turkish pattern:

Subject + object(s) + adverbial element + main verb

Yes, Turkish word order is flexible, although some orders sound more neutral than others.

For example, these are possible depending on emphasis:

• Ben dereotunu yoğurda karıştırmadan edemiyorum.
• Dereotunu yoğurda karıştırmadan edemiyorum.
• Yoğurda dereotunu karıştırmadan edemiyorum.

The original version is perfectly natural. Including Ben at the front gives a bit more personal emphasis.

In Turkish, changing word order usually changes focus or emphasis, not the core meaning.

It is grammatically singular, but in meaning it works more like a mass noun here.

So dereotu usually means:

• dill as an herb in general

It does not necessarily mean one single stalk of dill. In cooking contexts, Turkish often uses the singular form for ingredients in a general or mass sense.

So dereotunu yoğurda karıştırmak naturally means:

• to mix dill into yogurt

not necessarily:

• to mix one dill plant into yogurt

A very literal translation would be:

I cannot do without mixing the dill into the yogurt.

A more natural English translation is:

• I can’t help mixing dill into yogurt.
• I can’t resist mixing dill into yogurt.

So if you want to understand the grammar, the literal version is useful. If you want natural English, use the second type.

Yes, absolutely. -madan/-meden edememek is a very useful pattern and worth learning as a chunk.

A few examples:

• Gülmeden edemiyorum.
  I can’t help laughing.

• Bakmadan edemedim.
  I couldn’t help looking.

• Sormadan edemeyeceğim.
  I won’t be able to resist asking.

If you learn it as a set phrase meaning can’t help doing, sentences like this one become much easier to understand.