Puer deorsum ex turri spectat et flumen videt.

Because puer is the subject, and Latin often puts the subject near the beginning, especially in simple sentences. But Latin word order is much freer than English word order because the endings help show each word’s role.

So:

• puer = the boy
• spectat = looks
• videt = sees

Even if the order changed, the meaning could still stay basically the same as long as the endings remained clear.

Puer is nominative singular, which is the form normally used for the subject of the sentence.

You can tell because:

• the sentence needs a subject for spectat and videt
• puer is the dictionary form of the noun meaning boy
• it belongs to the second declension, but unlike many second-declension masculine nouns, it does not add -us in the nominative singular

So:

• puer = nominative singular, the boy

Some second-declension masculine nouns end in -er instead of -us in the nominative singular. Puer is one of them.

For example:

• servus = slave
• puer = boy

Its stem is still treated as a regular second-declension stem in many forms:

• nominative: puer
• genitive: puerī
• dative: puerō
• accusative: puerum

So this is just a normal pattern you learn as part of the second declension.

Deorsum means downward or down. It is an adverb, so it modifies the verb spectat.

Here it tells you how or in what direction the boy is looking:

• spectat = he looks
• deorsum spectat = he looks downward / he looks down

Because it is an adverb, it does not change its ending.

They do related jobs, but they are not identical.

• deorsum tells the direction of the looking: downward
• ex turri tells the place the boy is looking from: from/out of the tower

So the sentence is not just saying that he is in a tower. It is saying:

• he is positioned at/from the tower
• and he is looking down

Together they create the full picture: The boy looks downward from the tower and sees the river.

Turri is in the ablative singular.

The preposition ex takes the ablative and usually means out of or from. So:

• ex turri = from the tower / out of the tower

The noun turris, turris is third declension, and its ablative singular here is turri.

This is a very common pattern in Latin:

• ex urbe = out of the city
• ex aquā = out of the water
• ex turri = from the tower

Both ex and de can sometimes be translated as from, but they are not exactly the same.

• ex often suggests out of, from within, or from
• de often suggests down from, about, or concerning

With tower, ex turri naturally suggests the boy is at or in the tower, looking from it. Because the sentence already has deorsum for downward, using ex helps keep the roles separate:

• deorsum = downward
• ex turri = from the tower

So ex turri is a very natural choice here.

Yes, they are related, but they are not the same.

• spectat means looks at, watches, or gazes
• videt means sees

A helpful distinction is:

• spectare = the act of directing your eyes
• videre = the result of perception

So in this sentence:

• the boy looks downward
• and then sees the river

That is a very natural combination in Latin.

Flumen is the accusative singular here, because it is the direct object of videt.

The verb videt means he sees, and the thing seen is put in the accusative:

• videt flumen = he sees the river

Flumen is a third-declension neuter noun. Its nominative singular and accusative singular are the same:

• nominative: flumen
• accusative: flumen

So even though the form looks unchanged, its job in the sentence is object, not subject.

There are two main clues.

1. The verb is singular

• spectat
• videt

A singular verb can go with a singular subject, and puer is already a clear nominative singular subject.

2. Sentence structure and meaning

• puer ... videt = the boy sees
• what does he see? flumen

Also, in Latin, neuter nouns often have the same form in nominative and accusative singular, so you must use context and syntax to tell the difference.

Because Latin, like English, can use one subject with two verbs joined by et.

So this sentence works like:

• The boy looks downward and sees the river.

Latin does not need to repeat puer before the second verb, because it is understood to be the subject of both:

• puer ... spectat
• (puer) ... videt

This is very common.

Et means and. It joins the two actions:

• spectat = looks
• videt = sees

So:

• spectat et videt = looks and sees

It is one of the most common Latin conjunctions.

Classical Latin has no definite article and no indefinite article. So Latin does not have exact equivalents of English the and a/an in ordinary usage.

That means:

• puer can mean the boy or a boy
• flumen can mean the river or a river
• turri can mean the tower or a tower

Which English article to use depends on context. In a simple teaching sentence, the boy and the river are often the most natural translations.

Yes. Latin word order is flexible. For example, you could see variations such as:

• Puer ex turri deorsum spectat et flumen videt.
• Ex turri puer deorsum spectat et flumen videt.
• Flumen puer ex turri deorsum spectat et videt.
  This last one is more marked and would give flumen extra emphasis.

The endings and the verb forms help preserve the meaning. However, different word orders can change the emphasis or style, even if the basic meaning remains the same.

Both are present tense, third person singular, active voice, indicative mood.

So:

• spectat = he/she/it looks
• videt = he/she/it sees

Because the subject is puer, we translate them here as:

• the boy looks
• the boy sees

The endings -t show third person singular.

A simple classroom pronunciation would be:

• Puer: POO-er or roughly PWER depending on the system
• deorsum: deh-OR-soom
• ex turri: eks TOOR-ree
• spectat: SPEK-taht
• et: et
• flumen: FLOO-men
• videt: WEE-det in reconstructed classical pronunciation, or sometimes VEE-det in other traditions

A more classical-style pronunciation of the whole sentence would be roughly:

POO-er deh-OR-soom eks TOOR-ree SPEK-taht et FLOO-men WEE-det

Different teaching traditions pronounce Latin somewhat differently, so your class may use another system.