Mercator ex Aegypto chartam ad Alexandriam portat.

Mercator is the subject of the sentence, so it is in the nominative case.

• mercator = merchant
• nominative singular = the form used for who is doing the action

Since the merchant is the one carrying the paper, mercator stays in the nominative.

Because chartam is the direct object of portat.

The sentence is about what the merchant carries, and the thing being carried is chartam. In Latin, a feminine noun like charta often takes -am in the accusative singular.

So:

• charta = paper, sheet, map, document
• chartam = paper as the thing being carried

Latin uses case endings to show a noun’s job in the sentence.

Latin often uses a preposition + case to show movement away from somewhere.

Here:

• ex = out of, from
• Aegypto is in the ablative case, because ex takes the ablative

So:

• ex Aegypto = from Egypt

A learner should notice that English uses word order and prepositions, but Latin also changes the noun ending to match the preposition.

Because ex requires the ablative case, not the accusative.

• nominative: Aegyptus
• ablative: Aegypto

After ex, Latin uses the ablative to mean from/out of. So ex Aegypto is the correct form.

If you wrote Aegyptum, that would be accusative, which does not fit with ex.

Because ad is the preposition that commonly means to, toward, and it takes the accusative case.

So:

• ad = to, toward
• Alexandriam = accusative form of Alexandria

Together:

• ad Alexandriam = to Alexandria

This is a very common pattern in Latin:

• ad + accusative = movement toward
• ex + ablative = movement from

Because ad takes the accusative case.

• Alexandria = nominative form
• Alexandriam = accusative form

Since the sentence describes motion to the city, Latin uses ad Alexandriam.

So the ending changes not because the meaning of the city changes, but because its grammatical role changes.

Portat means carries, is carrying, or sometimes simply takes depending on context.

It is:

• 3rd person singular
• present tense
• from the verb porto, portare = to carry

So portat literally means he/she/it carries.

Because the subject is mercator (merchant), we understand:

• The merchant carries or
• The merchant is carrying

Latin present tense can often be translated in more than one natural way in English.

Classical Latin has no definite article and no indefinite article.

So:

• mercator can mean merchant, a merchant, or the merchant
• chartam can mean paper, a paper, or the paper

You decide from context which English article sounds best.

This is very normal in Latin. The language usually does not mark a/an/the directly.

Yes. Latin word order is often more flexible than English because the case endings show each word’s function.

So all of these could express basically the same core meaning:

• Mercator ex Aegypto chartam ad Alexandriam portat.
• Chartam mercator ex Aegypto ad Alexandriam portat.
• Ex Aegypto mercator chartam ad Alexandriam portat.

The endings tell you:

• mercator = subject
• chartam = direct object
• Aegypto after ex = from Egypt
• Alexandriam after ad = to Alexandria

That said, word order can affect emphasis. The given order is straightforward and natural.

Here it is treated like a regular noun after the preposition ad, so it appears in the accusative: Alexandriam.

In Latin, some city names can behave a little differently in certain expressions, especially when used without a preposition. But in this sentence, since ad is present, the construction is simple and regular:

• ad Alexandriam = to Alexandria

So for this sentence, the important point is just:

• ad takes the accusative

A helpful breakdown is:

• Mercator = subject
• ex Aegypto = from Egypt
• chartam = direct object
• ad Alexandriam = to Alexandria
• portat = verb

So the sentence is structured as:

[Subject] [from where] [object] [to where] [verb]

In smoother English, that becomes something like:

The merchant carries paper from Egypt to Alexandria.

Latin does not have to match English word order exactly, because the endings do much of the grammatical work.