Filius sororem ad forum sequitur, sed pater domi manet.

Filius is in the nominative case, which is the case normally used for the subject of the sentence.

Also, sequitur is third person singular, so it means he/she/it follows. Since filius is singular and nominative, it matches the verb naturally: the son follows.

By contrast, sororem is in the accusative case, so it is the direct object: the sister is the one being followed.

Because sororem is the accusative singular form of soror.

• soror = sister as a subject
• sororem = sister as a direct object

In this sentence, the son is following the sister, so sister is the object of the verb, not the subject. That is why Latin uses sororem.

Sequitur is from sequor, sequi, a deponent verb.

Deponent verbs:

• have passive-looking forms
• but have active meanings

So:

• sequitur looks like it might mean is followed
• but it actually means follows

This is very common in Latin, and sequor is one of the most important deponent verbs to learn early.

The ending -tur is the normal third person singular passive ending in Latin. But since sequor is a deponent verb, it uses passive endings with an active meaning.

So:

• sequitur = he/she/it follows
• not he/she/it is followed

This is just how deponent verbs work. You learn the special behavior as part of the verb.

Ad is a preposition meaning to or toward, and it takes the accusative case.

So:

• ad = to, toward
• forum = accusative singular of forum

Together, ad forum means to the forum.

This expresses movement toward a place. If Latin wanted to say in the forum, it would usually use a different construction, such as in foro.

Because forum is a neuter second-declension noun.

Neuter second-declension nouns usually have:

• nominative singular in -um
• accusative singular also in -um

So forum can be both nominative and accusative singular, depending on its role in the sentence. Here, after ad, it is accusative.

Domi means at home or at the house.

It is a special locative form of domus. The locative is an old case used mainly with names of cities, small islands, and a few special words such as domus.

So:

• domi = at home
• in domo can also mean in the house/home, but domi is a very common idiomatic way to say at home

A learner often just has to memorize domi as a special form.

Latin has no definite article and no indefinite article.

So Latin does not normally use separate words for:

• the
• a/an

That means:

• filius can mean the son or a son
• sororem can mean the sister or a sister
• pater can mean the father or a father

You decide from the context which English translation sounds best.

Yes. Latin word order is much freer than English word order because the case endings show each word’s role.

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

• Sororem filius ad forum sequitur
• Ad forum filius sororem sequitur

The endings still show:

• filius = subject
• sororem = object

That said, word order in Latin still matters for emphasis and style. The given order is a natural one, but not the only possible one.

In sed pater domi manet, pater is in the nominative singular, so it is the subject.

The verb manet is also third person singular, meaning he/she/it remains or stays. So pater and manet match:

• pater = the father
• manet = stays/remains

Together: the father stays/remains at home.

They are both third person singular present tense verbs, but they belong to different kinds of verbs.

• sequitur comes from a deponent verb (sequor), so it has passive-looking form but active meaning
• manet comes from a regular active verb (maneo, manere), so it has a normal active form and active meaning

So both are present tense, but only sequitur is deponent.

Sed means but.

It connects the two parts of the sentence and shows contrast:

• The son follows his sister to the forum
• but the father stays at home

So sed introduces the contrast between movement and staying put, or between what the son does and what the father does.

Yes. In Latin, sequor takes a direct object in the accusative.

So:

• sororem sequitur = he follows his sister

Even if English sometimes uses an extra word like after, Latin does not need that here. The accusative alone shows the object of sequitur.

Latin often leaves possessive ideas unstated when they are obvious from context.

So filius sororem sequitur literally just says the son follows the sister, but in context English may naturally translate it as the son follows his sister.

Latin does have possessive words like suam or eius, but it does not always use them if the relationship is already clear or easily understood.

They come from different declensions:

• filius — second declension masculine
• soror, sororem — third declension feminine
• forum — second declension neuter
• pater — third declension masculine
• domi — special locative form of domus, which is an irregular noun with mixed forms

This is a good example of how one Latin sentence can contain several noun patterns at once.