Tessellarius crustam sculpit.

Because crustam is the direct object of the verb sculpit. In Latin, the direct object is usually put in the accusative case.

• crusta = nominative singular, the crust / veneer / inlay
• crustam = accusative singular, the crust / veneer / inlay as the thing being acted on

So the sentence is using crustam because that is the thing the craftsperson is carving.

Tessellarius is in the nominative singular, which is the case normally used for the subject of a sentence.

The ending -us is a very common nominative singular ending for a second-declension masculine noun.

So in this sentence:

• tessellarius = the subject, the person doing the action
• crustam = the object, the thing receiving the action
• sculpit = the verb

The ending -it tells you that the verb is:

• third person
• singular
• present
• active
• indicative

So sculpit means he/she/it carves or is carving.

Because the subject here is tessellarius, which is a masculine noun referring to a male craftsperson, the natural translation is he carves.

The form sculpit comes from the verb sculpere, meaning to carve or to engrave.

A dictionary entry would typically give something like:

• sculpō, sculpere, sculpsī, sculptum

From that verb:

• sculpit = he/she/it carves

Latin does not have definite or indefinite articles like English the, a, or an.

So:

• tessellarius can mean the mosaic worker or a mosaic worker
• crustam can mean the crust / veneer / inlay or a crust / veneer / inlay

You decide from the context which English article sounds best.

Latin word order is more flexible than English word order because the case endings show each word’s role.

So in Tessellarius crustam sculpit:

• tessellarius is still the subject because it is nominative
• crustam is still the object because it is accusative
• sculpit is still the verb

Latin often places the verb at the end, so this sentence has a very normal Latin feel.

You could rearrange the words and still keep the basic meaning, for example:

• Crustam tessellarius sculpit

That would still mean the same thing, though it might shift emphasis.

Yes. The Latin present tense often covers both:

• he carves
• he is carving

English makes a distinction between simple present and present progressive, but Latin usually does not mark that difference explicitly.

So sculpit can be translated either way, depending on context.

Tessellarius is a noun for a worker connected with tessellae, the small cubes used in mosaics.

So it can mean something like:

• mosaic worker
• tile-worker
• maker of mosaics

It is a masculine noun in form, so it normally refers to a male worker.

Yes. In this sentence, tessellarius is a masculine second-declension noun, and the ending -us is typical for the nominative singular of that group.

That matters because it tells you the noun refers to a masculine person here. The verb sculpit itself does not show gender, but the noun does.

Because crusta would be nominative singular, which is the form for a subject, not a direct object.

If you said crusta sculpit, that would mean something like the crust carves, which is not what this sentence is trying to say.

Since the crust/inlay is the thing being carved, Latin uses the accusative:

• crustam

Crustam is:

• accusative
• singular
• probably first declension

Its nominative singular would be crusta.

A first-declension pattern looks like this in the singular:

• nominative: crusta
• accusative: crustam

So the sentence is using the expected object form.

In Latin, the verb ending already tells you a third-person singular subject is acting, but it does not tell you exactly who that subject is.

That is why the noun tessellarius is useful: it names the subject explicitly.

So:

• sculpit = he/she/it carves
• tessellarius sculpit = the mosaic worker carves

Latin can sometimes omit the subject when it is clear, but here it is stated.

A simple classroom pronunciation would be roughly:

• tes-sel-LAR-ee-us KRUS-tam SKUL-pit

A few helpful points:

• tessellarius has the stress on -lar-
• crustam has the stress on crus-
• sculpit has the stress on scul-

If you are using Classical pronunciation, c is always hard, like k.

So:

• crustam begins with a kr sound
• sculpit begins with a sk sound

Yes. Since Latin has no articles and the present tense is a bit broader than English, several translations are possible, such as:

• The mosaic worker carves the inlay.
• A mosaic worker is carving the veneer.
• The tile-worker carves a crust.

Which one is best depends on the vocabulary meaning you have been given and on the context. The Latin grammar stays the same.