Ο γιατρός μπήκε στο χειρουργείο.

A rough pronunciation guide is:

o ya-TROSS BEE-ke sto hee-roor-YEE-o

A few useful details:

• γιατρός = ya-TROSS
• μπήκε = BEE-ke
• χειρουργείο = hee-roor-YEE-o

Also, the accent marks show which syllable is stressed:

• γιατρός
• μπήκε
• χειρουργείο

One especially important point: at the beginning of a word, μπ is usually pronounced like English b.

ο is the definite article for a masculine singular noun in the nominative case.

So:

• ο γιατρός = the doctor

If you wanted a doctor, you would usually say:

• ένας γιατρός

In this sentence, ο γιατρός is the subject, so the nominative article is used.

Usually, yes: ο is the masculine article, so ο γιατρός normally refers to a male doctor.

For a female doctor, standard Modern Greek often uses:

• η γιατρός

So the noun γιατρός itself can be used for either sex, and the article helps show the gender.

μπήκε is the aorist form, 3rd person singular, of μπαίνω (to enter / to go in).

Here it means a completed action in the past:

• μπήκε = entered / went in

This is why it matches English simple past well.

Compare:

• μπαίνει = enters / is entering (present)
• έμπαινε = was entering / used to enter (imperfect)
• μπήκε = entered (aorist)

Greek often does not use subject pronouns unless they are needed for emphasis or contrast.

So instead of saying something like He entered..., Greek can simply say:

• μπήκε = he/she entered

The verb ending already shows the person, and in this sentence the subject is also stated explicitly:

• ο γιατρός

So adding a pronoun would usually be unnecessary.

στο is a contraction of:

• σε + το = στο

Here:

• σε = a preposition that can mean in, at, to, into
• το = the for a neuter singular noun

So:

• στο χειρουργείο = literally in/to the operating room

These contractions are very common:

• σε τον → στον
• σε την → στην
• σε το → στο

The preposition σε normally takes the accusative case.

So the phrase is built as:

• σε + το χειρουργείο → στο χειρουργείο

A useful thing to know is that for many neuter singular nouns, the nominative and accusative look the same. So even though χειρουργείο is functioning after a preposition, its form does not visibly change here.

That is why the phrase looks simple, even though there is case grammar behind it.

In Greek, σε can cover several meanings that English separates:

• in
• at
• to
• into

The verb helps determine the meaning.

Because μπαίνω means enter / go in, the phrase naturally has the sense of movement:

• μπήκε στο χειρουργείο = entered / went into the operating room

So Greek does not need a separate word exactly matching English into here.

Yes. Greek word order is more flexible than English.

The sentence:

• Ο γιατρός μπήκε στο χειρουργείο.

is a neutral, straightforward order.

But Greek can also say:

• Μπήκε ο γιατρός στο χειρουργείο.

This still means the same basic thing, but the emphasis may shift slightly, often toward the action or the flow of the story.

Because Greek marks words with articles and verb forms, it can move things around more freely than English.

Accent marks in Greek are normally written and show where the stress falls.

In this sentence:

• γιατρός → stress on the last syllable
• μπήκε → stress on the first syllable
• χειρουργείο → stress on -γεί-

This matters because stress is a real part of the word in Greek. If you put the stress in the wrong place, you may sound unnatural or even create confusion.

So when learning Greek vocabulary, it is best to learn the word together with its stress.