Ben yarın toplantıda olmayacağım.

Yes. In Turkish, the ending on the verb often already shows the subject.

In olmayacağım, the -ım part means I, so ben is not strictly necessary. The sentence could simply be:

Yarın toplantıda olmayacağım.

Adding ben usually gives extra emphasis or contrast, like:

• Ben yarın toplantıda olmayacağım.
  = I won’t be at the meeting tomorrow.
  (maybe implying someone else will)

So ben is optional here, but natural if the speaker wants emphasis.

Yarın means tomorrow.

It does not have to stay exactly in that position. Turkish word order is flexible, although some orders sound more neutral than others.

Common possibilities:

• Ben yarın toplantıda olmayacağım.
• Yarın ben toplantıda olmayacağım.
• Toplantıda yarın olmayacağım.
• Yarın toplantıda olmayacağım.

The most neutral version is usually something like Ben yarın toplantıda olmayacağım or Yarın toplantıda olmayacağım.

Changing the order can shift emphasis, but not the core meaning.

Toplantıda means at the meeting or in the meeting.

It is made of:

• toplantı = meeting
• -da = in / at / on (location suffix)

So:

• toplantı → meeting
• toplantıda → at the meeting

This is the locative case, used for being in or at a place/event.

This is due to vowel harmony.

The locative suffix has forms like:

• -da / -de
• and after some consonants, -ta / -te

Since toplantı ends with the vowel ı, the suffix becomes -da, giving:

• toplantıda

Very roughly:

• back vowels usually take -da
• front vowels usually take -de

So this is a normal vowel harmony pattern.

Because the sentence means to be at the meeting, not to go to the meeting.

• toplantıda = at/in the meeting → location
• toplantıya = to the meeting → direction

Compare:

• Yarın toplantıda olmayacağım.
  = I will not be at the meeting tomorrow.

• Yarın toplantıya gitmeyeceğim.
  = I will not go to the meeting tomorrow.

So -da fits the idea of location, while -ya would fit movement toward something.

It can be broken down like this:

• ol- = be / become
• -ma- = negative
• -yacak- = future
• -ım = I

So:

ol-ma-yacak-ım
= I will not be

This is a very useful pattern in Turkish:

• verb stem
• negative marker
• tense marker
• personal ending

For example:

• gelmeyeceğim = I will not come
• gitmeyeceğim = I will not go
• yapmayacağım = I will not do

The y is a buffer consonant.

Turkish often inserts y between vowels to make pronunciation smoother. Without it, the word would be awkward.

So the structure is:

• olma + acak → olmayacak
• then olmayacağım

You will see this buffer y in many other forms too.

Because değilim is present tense, while olmayacağım is future.

Compare:

• Toplantıda değilim.
  = I am not at the meeting.

• Toplantıda olmayacağım.
  = I will not be at the meeting.

So if the sentence refers to tomorrow, Turkish needs a future form, which is why olmayacağım is used.

Also, değil is the standard negation of nominal/adjectival predicates in the present, but for future meaning, olmayacağım is the natural choice here.

Yes, in this sentence olmak is functioning like to be.

Turkish often handles to be differently from English. In the present tense, Turkish frequently has no separate word for am/is/are. But in other tenses, forms of olmak are often used.

So:

• Toplantıdayım. = I am at the meeting.
• Toplantıda değilim. = I am not at the meeting.
• Toplantıda olacağım. = I will be at the meeting.
• Toplantıda olmayacağım. = I will not be at the meeting.

It can suggest that idea in context, but literally it means:

I will not be at the meeting tomorrow.

That focuses on absence from the meeting.

If you want to say specifically I will not attend the meeting, Turkish often uses:

• Yarın toplantıya katılmayacağım.
• Yarın toplantıya gitmeyeceğim.
  depending on the exact meaning

So:

• toplantıda olmayacağım = I won’t be there / I won’t be at the meeting
• toplantıya katılmayacağım = I won’t attend the meeting

They are close, but not exactly identical.

No. Turkish does not use articles the way English does.

So toplantı can mean:

• meeting
• a meeting
• the meeting

The exact meaning depends on context.

In this sentence, toplantıda is usually understood as at the meeting because the context probably makes it clear which meeting is meant.

Yes. Turkish often allows shorter sentences when the context is clear.

For example:

• Yarın toplantıda olmayacağım.
  Very natural.

You could even say this in the right context:

• Yarın olmayacağım.
  = I won’t be there tomorrow.
  But only if where is already understood.

So Turkish often omits information that is already obvious from context.

A helpful way to read it is:

• Ben = I
• yarın = tomorrow
• toplantıda = at the meeting
• olmayacağım = will not be

So the sentence follows a very common Turkish pattern:

subject + time + place + verb

That is one of the most useful default patterns for learners. The verb usually comes at the end.