Servus hospitem per ianuam in atrium ducit.

In Latin, the case ending usually tells you a noun’s job in the sentence.

• servus is nominative singular, which is the form typically used for the subject
• hospitem is accusative singular, which is the form typically used for the direct object

So even if you did not rely on word order, the endings tell you that:

• servus = the one doing the action
• hospitem = the person being led

That is one of the biggest differences from English, where word order does much more of that work.

Because hospitem comes from the noun hospes, and hospes is a third-declension noun.

Its forms include:

• nominative singular: hospes
• accusative singular: hospitem

So the -em ending here marks the accusative singular form of a third-declension noun.

This is something learners often need to get used to: in Latin, you cannot guess all forms from the dictionary form alone unless you also know the declension pattern.

Because both are objects of prepositions that take the accusative here.

• per ianuam = through the door
• in atrium = into the atrium

In Latin, prepositions govern specific cases. Here:

• per always takes the accusative
• in takes the accusative when it shows motion into something

So:

• ianuam is accusative after per
• atrium is accusative after in

These are not direct objects of the verb; they are objects of prepositions.

They express two different kinds of movement.

• per means through or by way of
• in with the accusative means into

So the sentence gives a path:

• per ianuam = through the door
• in atrium = into the atrium

That means the movement is not just generally toward the house, but specifically through the door and into the atrium.

Yes, in can take either accusative or ablative, depending on the meaning.

A very common rule is:

• in + accusative = movement into or onto
• in + ablative = location in or on

So compare:

• in atrium = into the atrium → motion, so accusative
• in atrio = in the atrium → location, so ablative

In your sentence, someone is being led from one place to another, so Latin uses in atrium.

ducit is a form of the verb ducere, meaning to lead.

Here it is:

• third person
• singular
• present tense
• active voice
• indicative mood

So ducit means he leads, she leads, or it leads, depending on the subject.

Since the subject here is servus, the verb means the slave/servant leads.

Classical Latin does not have articles like English the and a/an.

So:

• servus can mean a slave, the slave, or sometimes just slave depending on context
• hospitem can mean a guest or the guest

The exact force is usually understood from the situation, not from a separate word.

This is very normal in Latin, and learners quickly get used to supplying the or a naturally when translating.

Latin word order is much more flexible than English word order because the endings carry so much information.

So this sentence could be rearranged in several ways without changing the basic meaning, for example:

• Servus hospitem per ianuam in atrium ducit
• Hospitem servus per ianuam in atrium ducit
• Per ianuam servus hospitem in atrium ducit

The meaning stays basically the same because:

• servus is still nominative
• hospitem is still accusative
• the prepositions still govern their nouns

However, changing the order can change emphasis or style. Latin authors often move words around for focus, rhythm, or contrast.

Because Latin dictionaries usually list nouns in the nominative singular, but a noun changes form depending on its role in the sentence.

For hospes:

• nominative singular: hospes
• genitive singular: hospitis
• accusative singular: hospitem

From the genitive hospitis, you can see the stem hospit-. That stem appears in forms like hospitem.

This is a very common Latin pattern:

• dictionary form gives you one form
• actual sentence use may require a different case form

In a restored Classical pronunciation, you could say it approximately like this:

SEHR-woos HOS-pi-tem pehr yah-NOO-am in AH-tree-um DOO-kit

A few useful points:

• v is pronounced like English w
• c is always hard, like k
• i before another vowel can sound like y, so ianuam begins roughly yah-
• u is like oo
• ducit has a hard c: doo-kit

A more careful breakdown:

• Servus = SEHR-woos
• hospitem = HOS-pi-tem
• per = pehr
• ianuam = yah-NOO-am
• in = in
• atrium = AH-tree-um
• ducit = DOO-kit

Latin often gives movement in a very concrete, step-by-step way.

Here the sentence describes both:

1. the route taken: per ianuam = through the door
2. the destination reached: in atrium = into the atrium

If you removed one phrase, the sentence would lose some detail:

• without per ianuam, you know the destination but not the route
• without in atrium, you know the route but not exactly where the movement ends

So using both phrases makes the action more vivid and precise.