Στο γραφείο χαιρετάω όλους, αλλά συνήθως συναντιέμαι μόνο με δύο συναδέλφισσες στο διάλειμμα.

Στο is a contraction of σε + το.

• σε = in / at / to
• το = the for a neuter noun

So:

• στο γραφείο = in the office / at the office

This is extremely common in Greek:

• σε + το = στο
• σε + τη = στη(ν)
• σε + τον = στον

Here, γραφείο is a neuter noun, so το γραφείο becomes στο γραφείο after σε.

Because γραφείο is a neuter noun, and in the singular its nominative and accusative forms are the same.

You learn it as:

• το γραφείο = the office

After σε, Greek normally uses the accusative, but for neuter singular nouns like this, the form does not change:

• nominative: το γραφείο
• accusative: το γραφείο

So στο γραφείο is exactly what you would expect.

Yes. χαιρετάω and χαιρετώ both mean I greet / I say hello to.

This is one of those Greek verbs that has two common present-tense forms:

• χαιρετάω
• χαιρετώ

Both are standard. In everyday speech, many verbs of this type often appear in the -άω form.

So:

• χαιρετάω όλους = I greet everyone

You may also see related forms like:

• χαιρετάς / χαιρετάτε
• χαιρετώ / χαιρετείς / χαιρετεί

Because όλους is the accusative plural masculine form, and it is the direct object of χαιρετάω.

Compare:

• όλοι = all / everyone as a subject
• όλους = everyone / all of them as an object

In this sentence, the speaker is doing the action to them:

• χαιρετάω όλους = I greet everyone

So Greek uses the object form, όλους.

This is a very common learner question. συναντιέμαι is grammatically in the middle/passive form, but its meaning here is not a true passive like I am met.

Instead, it often means:

• I meet (with someone)
• I get together with
• I see each other / have a meeting

This contrasts with the active verb:

• συναντάω κάποιον = I meet someone
• συναντιέμαι με κάποιον = I meet with someone

So the sentence uses συναντιέμαι because the idea is more like I meet up with two colleagues, not simply I encounter them.

Because συναντιέμαι usually goes with με when you say who you are meeting with.

So:

• συναντιέμαι με φίλους = I meet with friends
• συναντιέμαι με δύο συναδέλφισσες = I meet with two female colleagues

This is just the normal pattern of the verb in this meaning.

By contrast, with the active form you often do not use με:

• συναντάω δύο συναδέλφους = I meet two colleagues

So the preposition depends on which verb form and meaning you are using.

συναδέλφισσες is the plural of συναδέλφισσα, meaning female colleague.

Basic forms:

• singular: η συναδέλφισσα
• plural: οι συναδέλφισσες

In this sentence, it comes after με δύο, and the plural noun appears as συναδέλφισσες.

A useful point: for this noun, the nominative plural and accusative plural look the same:

• nominative plural: οι συναδέλφισσες
• accusative plural: τις συναδέλφισσες

Since there is no article here, you just see δύο συναδέλφισσες.

Because συναδέλφισσες specifically means female colleagues.

Compare:

• συνάδελφος = colleague (common-gender noun; can refer to a man or a woman depending on context)
• συναδέλφισσα = female colleague

So:

• δύο συναδέλφισσες = two female colleagues

If the sentence used συναδέλφους, that would normally be the masculine plural accusative form and could mean male colleagues or a mixed group, depending on context.

In Modern Greek, δύο is normally unchanged. It does not inflect for gender or case in ordinary use.

So you get:

• δύο άντρες
• δύο γυναίκες
• δύο παιδιά
• με δύο συναδέλφισσες

That makes δύο much simpler than numbers in some other languages.

Here μόνο means only, and it limits με δύο συναδέλφισσες.

So the idea is:

• I usually meet only with two colleagues during the break

It tells you that, out of everyone at the office, the speaker meets socially or regularly with just those two.

Its position is natural Greek word order, and it is placed right before the phrase it emphasizes.

συνήθως is an adverb meaning usually.

It modifies συναντιέμαι:

• αλλά συνήθως συναντιέμαι... = but I usually meet...

Greek adverbs are fairly flexible in position, but putting συνήθως before the verb is very common and natural.

Because Greek often uses the article where English may or may not use it.

• στο διάλειμμα = at the break / during the break

In natural English we might simply say at break or during the break, but Greek strongly prefers the article here.

Again, στο is σε + το:

• το διάλειμμα = the break
• στο διάλειμμα = at/during the break

Greek word order is more flexible than English, although not completely free.

The given sentence is very natural:

• Στο γραφείο χαιρετάω όλους, αλλά συνήθως συναντιέμαι μόνο με δύο συναδέλφισσες στο διάλειμμα.

But other orders are possible for emphasis. For example:

• Χαιρετάω όλους στο γραφείο...
• Αλλά μόνο με δύο συναδέλφισσες συναντιέμαι συνήθως στο διάλειμμα.

These alternatives may sound more marked or emphasize different parts of the message.

So yes, the order can change, but the original version is a neutral, natural way to say it.

A few useful points:

• χαιρετάω → stress on τά
• όλους → stress on ό
• συνήθως → stress on νή
• συναντιέμαι → stress on the final part -έμαι
• συναδέλφισσες → stress on δέλ
• διάλειμμα → stress on διά

Also:

• χ in χαιρετάω is not like English ch. It is a throaty sound, like the ch in German Bach or Scottish loch.
• αι in συναντιέμαι is pronounced like e in Modern Greek.
• Double consonants in spelling, such as μμ in διάλειμμα, are usually not pronounced as long consonants in normal Modern Greek speech.

So pronunciation is not always obvious from English habits, but the stress marks help a lot.