In alta quercu aquila sedet et procul campos spectat.

Because in is being used to show location: the eagle is in / on the oak tree, not moving into it.

A very common Latin pattern is:

• in + ablative = in, on (location)
• in + accusative = into, onto (movement toward)

So:

• in alta quercu = in/on the tall oak
• if there were motion into it, Latin would use a different form

Here quercu is the ablative singular.

Because both words must match the case needed by in.

Since in here takes the ablative, both the noun and the adjective are ablative singular:

• quercu = ablative singular of quercus
• alta = ablative singular feminine of altus, alta, altum

So alta quercu means in/on the tall oak.

If the phrase were using the accusative, then you would get forms like altam quercum, but that would suggest motion into / onto the tree.

Because grammatical gender in Latin does not always match the ending you might expect.

Quercus is a good example:

• dictionary form: quercus
• gender: feminine
• meaning: oak or oak tree

So even though -us often suggests a masculine noun in the 2nd declension, quercus is different. It is a 4th-declension feminine noun.

That is why its adjective is feminine too:

• alta quercu, not alto quercu

Because aquila is the subject of the sentence: it is the one doing the actions.

The eagle:

• sedet = sits / is perched
• spectat = looks at / watches

So aquila is nominative singular, the normal case for the subject.

Because Latin has no articles.

English uses:

• the
• a / an

Latin usually does not. So:

• aquila can mean an eagle or the eagle
• campos can mean fields or the fields

You figure out which one is best from the context.

Latin word order is much more flexible than English word order because Latin uses case endings to show how words function.

English depends heavily on position:

• The eagle sees the fields is different from
• The fields see the eagle

Latin can move words around more freely because the endings already show:

• aquila = subject
• campos = object

So In alta quercu aquila sedet et procul campos spectat is a natural Latin arrangement.

This order also gives a nice flow:

1. the setting first: In alta quercu
2. then the subject: aquila
3. then the actions: sedet and spectat

Yes, literally sedet means sits or is sitting, but in this sentence it is often best understood as is perched.

For a bird in a tree, English usually says:

• The eagle is perched

Latin still uses sedet, because the basic idea is that the eagle is seated/resting in position.

Because procul is an adverb meaning far away, at a distance, or from afar.

Here it modifies spectat:

• procul spectat = looks from far away / gazes into the distance

So the sentence is expressing not just that the eagle sees the fields, but that it is looking out over them from a distance.

Because campos is the direct object of spectat.

The verb spectat means looks at, watches, or observes, so it takes an object in the accusative:

• campos spectat = it watches the fields

Campos is accusative plural of campus.

Because campos is the accusative plural form of campus, meaning field.

So:

• campum = field (singular accusative)
• campos = fields (plural accusative)

The sentence describes the eagle looking over a wide landscape, so the plural makes good sense.

A learner often notices that both can relate to seeing, but they are not exactly the same.

• videt = sees
• spectat = looks at, watches, gazes at

So spectat suggests a more deliberate or sustained action. The eagle is not just accidentally seeing the fields; it is actively looking out over them.

Because Latin usually does not need one. The verb ending already tells you the person and number.

Both:

• sedet
• spectat

are 3rd person singular, so they mean:

• he/she/it sits
• he/she/it looks

Since aquila is already stated as the subject, Latin does not need to add a separate pronoun.

Here et connects two actions done by the same subject.

The structure is:

• aquila sedet
• et procul campos spectat

So the eagle both:

1. sits / is perched
2. looks at the fields from afar

You can think of it as one sentence with one subject and two coordinated verbs.

Either can work depending on how natural you want the English to sound.

Strictly speaking:

• in often means in
• but with something like a bird in a tree, English often prefers on or in

So possible translations include:

• The eagle sits in a tall oak
• The eagle is perched on a tall oak
• The eagle sits in the tall oak

The Latin itself is simply expressing location with in + ablative.

Yes:

• In = in / on
• alta = tall, high
• quercu = oak, oak tree (ablative singular)
• aquila = eagle
• sedet = sits, is sitting, is perched
• et = and
• procul = far away, from afar, into the distance
• campos = fields (accusative plural)
• spectat = looks at, watches, surveys

So grammatically the sentence is:

• In alta quercu = prepositional phrase showing location
• aquila = subject
• sedet and spectat = two verbs
• campos = object of spectat