Dişçi hanım, yarın sabah tekrar gelmemi istedi.

Dişçi means dentist, and hanım is a polite word meaning something like lady / madam / Ms.

Together, dişçi hanım is a respectful way to refer to a female dentist. In this sentence, it is the subject of the sentence.

A few notes:

• hanım after a profession often adds politeness.
• It does not literally work exactly like English lady dentist in every situation, but that is a useful rough sense.
• A more formal word for dentist is diş hekimi.

In the intended meaning, it is the subject: the dentist is the one who made the request.

So the structure is basically:

• Dişçi hanım = the dentist
• ... istedi = asked / wanted

If it were direct address, the sentence would need a different context, and it would not match the given meaning.

The comma is not the main grammar point here, and many learners will also see this sentence written without a comma:

Dişçi hanım yarın sabah tekrar gelmemi istedi.

The comma just suggests a small pause or a topicalized opening. In very plain neutral writing, leaving it out would also be natural.

So:

• with comma = slight pause/emphasis
• without comma = also normal

Using hanım makes the reference more polite and respectful.

Compare:

• dişçi = dentist
• dişçi hanım = the lady dentist / the dentist ma’am / the female dentist in a polite way

Turkish often uses words like bey and hanım with names and professions:

• Doktor Bey
• Öğretmen Hanım
• Müdür Bey

So here hanım softens the tone and sounds more courteous.

Gelmemi can be broken down like this:

• gel- = come
• -me = verbal noun suffix, giving coming
• -m = my
• -i = accusative case

So gelmemi literally means my coming.

In the sentence, Turkish uses this structure where English would say me to come.

No. Here, -me is not negative.

In this sentence, it is the verbal noun ending, making gelme = coming.

So:

• gelme here = coming
• gelmemi = my coming

This is a very common point of confusion because -me / -ma can also appear in negative forms. Context tells you which one it is.

For example:

• gelmemi istedi = asked/wanted me to come
• gelmememi istedi = asked/wanted me not to come

Because these two forms mean different things.

• gelmek istedi = he/she wanted to come
• gelmemi istedi = he/she wanted/asked me to come

That is the key difference:

• with gelmek istedi, the same person is both the wanter and the one who comes
• with gelmemi istedi, the main subject is one person, but the person doing the coming is me

So Turkish uses -mA + possessive to show who is supposed to do the action in the subordinate clause.

It is built into gelmemi.

The -m part means my, so gelmemi literally means my coming. Turkish often expresses someone to do something using this kind of possessed verbal noun.

That is why there is no separate English-style me before the verb.

If you wanted to make the person more explicit, Turkish could also say:

Benden yarın sabah tekrar gelmemi istedi.

That adds the sense of She asked me to come again tomorrow morning.

Yes, istemek basically means to want, but in this structure it often has the sense of asking/requesting that someone do something.

So:

• kahve istedi = wanted coffee / asked for coffee
• gelmemi istedi = wanted my coming / asked me to come

In other words, English may translate istemek as want, ask for, or request, depending on the structure and context.

Because it is a time expression, and Turkish often uses time expressions directly as adverbs.

So:

• yarın = tomorrow
• sabah = morning
• yarın sabah = tomorrow morning

No case ending is needed here. This is very normal in Turkish, just like:

• bugün = today
• dün akşam = yesterday evening
• pazartesi sabah = Monday morning

Tekrar means again.

Here it modifies gelmemi, so the idea is to come again.

Its position is fairly natural here:

• yarın sabah tekrar gelmemi istedi

Turkish word order is flexible, so you may also see similar variants with slightly different emphasis. But in this sentence, tekrar before gelmemi is perfectly normal.

Yes. This is a very natural Turkish pattern.

The basic order is:

• Dişçi hanım = subject
• yarın sabah = time expression
• tekrar gelmemi = object-like subordinate clause
• istedi = main verb

Turkish often places the main verb at the end, so this sentence fits standard Turkish word order very well.

Because the sentence reports something the dentist said or requested earlier.

İstedi = wanted / asked

• iste- = want / ask for
• -di = past tense

So the request happened in the past, even though the coming is supposed to happen yarın sabah.

That contrast is very normal:

• the asking happened before
• the coming is supposed to happen later

Yes, often it could.

• tekrar = again
• yeniden = again / anew

So yarın sabah yeniden gelmemi istedi would also be understandable and natural.

In everyday speech, tekrar is extremely common.