O gelince, biz birlikte kahve içeceğiz.

Gelince comes from the verb gelmek (to come) plus the ending -ince/-ınca, which often means when or once.

• gel- = come
• -ince = when / once

So o gelince means when he/she/it comes or once he/she/it comes.

This structure is very common in Turkish:

• Ben gelince = when I come
• Sen gelince = when you come
• Yağmur yağınca = when it rains

In Turkish, ideas like when, after, or because are often built directly onto the verb with suffixes instead of using a separate linking word the way English often does.

So instead of saying something exactly like when he comes, Turkish commonly says:

• o gelince

This is a very natural Turkish pattern. English uses separate words more often; Turkish uses endings more often.

O usually means he, she, or it, depending on context. Turkish does not mark gender in third-person singular pronouns.

So o gelince could mean:

• when he comes
• when she comes
• when it comes

You know which one is meant from context.

Yes, it could. Turkish often drops subject pronouns because the verb ending already shows the subject.

• içeceğiz = we will drink

So birlikte kahve içeceğiz already means we will drink coffee together.

Adding biz gives emphasis or clarity:

• biz birlikte kahve içeceğiz = we will drink coffee together

It can help contrast with someone else, or simply make the subject more explicit.

Birlikte means together.

In this sentence:

• biz birlikte kahve içeceğiz = we will drink coffee together

Its position is flexible, but some placements sound more natural than others. For example:

• Biz birlikte kahve içeceğiz.
• Biz kahveyi birlikte içeceğiz.
• Birlikte kahve içeceğiz.

Turkish word order is flexible, but changing the position can slightly change emphasis.

İçeceğiz comes from içmek (to drink) and is the future tense in the we form.

Breakdown:

• iç- = drink
• -ecek / -acak = future tense marker
• -iz / -ız / -uz / -üz type personal ending = we

Because of sound changes, the form becomes içeceğiz.

So:

• içeceğim = I will drink
• içeceksin = you will drink
• içecek = he/she/it will drink
• içeceğiz = we will drink

Yes, kahve içmek is the normal way to say to drink coffee.

In Turkish, beverages are typically used with içmek:

• su içmek = to drink water
• çay içmek = to drink tea
• kahve içmek = to drink coffee

This works very much like English.

The comma separates the time clause from the main clause:

• O gelince, = when he/she comes
• biz birlikte kahve içeceğiz. = we will drink coffee together

The comma helps readability, especially when the sentence starts with a subordinate clause. In everyday writing, punctuation can vary a little, but this comma is very normal and helpful.

Not completely. Turkish word order is more flexible than English, although some orders are more neutral than others.

The given sentence:

• O gelince, biz birlikte kahve içeceğiz.

This is very natural. You could also hear:

• O gelince birlikte kahve içeceğiz.
• Biz o gelince birlikte kahve içeceğiz.
• Kahve içeceğiz o gelince.
  This is possible, but it gives a different emphasis and is less neutral.

The most neutral place for the main verb is usually near the end, as in this sentence.

Yes, depending on context, -ince can sometimes feel like when or once/after.

So o gelince may suggest:

• when he comes
• once he comes
• after he comes

The exact nuance depends on the situation. In this sentence, it most naturally means that his/her arrival is the point after which the coffee-drinking will happen.

A simple approximate pronunciation is:

• gelince ≈ geh-lin-jeh
• içeceğiz ≈ ee-cheh-jeh-eez

A few helpful points:

• c in Turkish is like English j in jam
• ç is like English ch
• g before e/i is a normal hard g
• ğ usually lengthens or smooths the surrounding vowel rather than sounding like a strong consonant

So içeceğiz does not sound like every letter is pronounced strongly and separately; it flows smoothly.

Yes. O geldiğinde also means when he/she comes or when he/she has come, depending on context.

There is a slight difference in structure:

• o gelince = when he/she comes
• o geldiğinde = when he/she comes / when he/she has arrived

Both can work here.
For many learners, gelince feels a bit simpler and very common in everyday Turkish.

Yes, it is natural and correct.

A very common everyday version would be:

• O gelince birlikte kahve içeceğiz.

That version omits biz, because içeceğiz already shows we. But the original sentence is still perfectly fine, especially if you want to emphasize we.