Cancer prope mare est.

Mare is accusative singular here, because it is the object of the preposition prope.

A detail that often confuses learners: mare is a neuter third-declension noun, and its nominative singular and accusative singular are the same form. So even though mare looks unchanged, its role in the sentence is determined by grammar, not by a visible ending.

Its dictionary form is mare, maris.

In Latin, different prepositions govern different cases, and you simply have to learn which case each one takes.

Prope means near and normally takes the accusative:

• prope mare = near the sea

So even though English uses near without any obvious case marking, Latin treats prope as a preposition that requires the accusative.

It is true that many location-related expressions use the ablative, but not all of them do. Prope is one of the ones that takes the accusative.

Cancer is the subject of the sentence. It is in the nominative singular.

So the basic structure is:

• Cancer = subject
• est = verb
• prope mare = prepositional phrase

In other words, Cancer is the thing that is near the sea.

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

So:

• Cancer prope mare est
• Cancer est prope mare
• Prope mare cancer est

can all be understood, though they may sound slightly different in emphasis or style.

Putting the verb at or near the end is very common in Latin prose, so est at the end is perfectly normal.

Latin has no articles like English the or a/an.

So cancer can mean:

• a crab
• the crab

and mare can mean:

• a sea
• the sea

The context tells you which sense is best in translation. English has to choose an article, but Latin usually does not.

No. Prope can be used in more than one way.

In this sentence, it is a preposition followed by a noun:

• prope mare = near the sea

But prope can also be used more like an adverb, meaning nearby, almost, or nearly, depending on context.

Here, though, the structure is clearly prepositional: prope + mare.

In a common reconstructed Classical pronunciation, you could say it roughly like this:

• Cancer = KAN-ker
• prope = PRO-pe
• mare = MA-re
• est = est

So the whole sentence is roughly:

KAN-ker PRO-pe MA-re est

A few useful points:

• c in Classical Latin is always hard, like k
• e is always pronounced, never silent
• r is usually trilled or tapped

Sometimes Latin can omit a form of to be, especially in certain styles, short statements, poetry, or inscriptions. But in a simple sentence like this, est is completely normal and expected.

So for a learner, the safest understanding is:

• Cancer prope mare est = a standard full sentence
• est is the verb is

You should not assume that est can always be omitted in ordinary beginner prose.

Because ad and prope do not mean the same thing.

• prope mare = near the sea
• ad mare = to the sea, toward the sea, or sometimes at/by the sea depending on context

If the idea is specifically near, then prope is the clearer choice.

So a native English speaker should not think of ad as the automatic translation for every place-related phrase. Latin chooses different prepositions for different relationships.

Not necessarily. In Latin, cancer can have several meanings depending on context, including:

• crab
• Cancer as the zodiac sign
• sometimes cancer in the medical sense

But since the meaning has already been given to the learner, the important grammatical point here is that cancer is just a noun in the nominative singular serving as the subject.

So vocabulary determines which meaning is intended; grammar tells you how the word functions in the sentence.