Nauta delphinum in mari spectat.

The subject is nauta.

You can tell because nauta is in the nominative singular, the case typically used for the subject of a sentence. Also, the verb spectat is third person singular, so it matches a singular subject: the sailor watches.

That is a very common beginner question.

Nauta is a first-declension noun, and many first-declension nouns do end in -a. Most first-declension nouns are feminine, but a small group referring to traditionally male jobs or roles are masculine, including:

• nauta = sailor
• agricola = farmer
• poeta = poet

So the ending -a does not always mean a noun is feminine.

Because delphinum is the direct object of the verb.

The dictionary form is delphinus, meaning dolphin. But in the sentence, the dolphin is the thing being watched, so Latin puts it in the accusative singular:

• delphinus = nominative singular
• delphinum = accusative singular

So nauta delphinum spectat means the sailor watches the dolphin, with delphinum marked as the object.

Because in here means in or on, expressing location, so it takes the ablative case.

The noun is mare, maris, meaning sea. Its ablative singular form is mari. So:

• in mari = in the sea

This is an important pattern:

• in + ablative = location, in/on
• in + accusative = motion into, into/onto

Yes, but it would mean something different.

• in mari = in the sea or on the sea
• in mare = into the sea

So if the sentence described movement into the sea, Latin would use the accusative:

• Nauta in mare currit = The sailor runs into the sea

But in your sentence, there is no motion into the sea; it just tells you where the dolphin is being watched, so in mari is correct.

Spectat is the verb, and it gives you several pieces of information at once:

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

It comes from spectare, meaning to watch, to look at, or to observe.

So spectat means he/she/it watches or sometimes is watching, depending on context.

Yes.

Latin does not have a separate verb form that works exactly like the English progressive in every case. The present tense often covers both ideas:

• he watches
• he is watching

Context tells you which English translation sounds more natural.

Because Latin does not have articles like English does.

So a noun like nauta can mean:

• a sailor
• the sailor

And delphinum can mean:

• a dolphin
• the dolphin

You choose the best English article from the context.

No. Latin word order is much freer than English word order because the endings show what each word is doing.

In English, The sailor watches the dolphin cannot easily become The dolphin the sailor watches without sounding marked or unusual. In Latin, the endings make the roles clear:

• nauta = subject
• delphinum = object
• mari = ablative after in
• spectat = verb

So Latin could rearrange the sentence in different ways, such as:

• Nauta delphinum in mari spectat
• Delphinum nauta in mari spectat
• In mari nauta delphinum spectat

These can all mean basically the same thing, though the emphasis may change.

The forms show it.

• nauta = singular subject
• delphinum = singular object
• spectat = singular verb

If it were plural, you would expect different endings, for example:

• nautae = sailors
• delphinos = dolphins
• spectant = they watch

So the sentence clearly refers to one sailor and one dolphin.

They are:

• nauta, nautae = sailor
• delphinus, delphini = dolphin
• mare, maris = sea
• specto, spectare = watch, look at

These dictionary forms are important because Latin words change their endings depending on their job in the sentence.