Tonsor barbam avi diligenter curat.

Because tonsor is in the nominative singular, the case normally used for the subject of a sentence.

• tonsor = barber
• dictionary form: tonsor, tonsōris (masculine)

In this sentence, tonsor is the person doing the action of curat.

Because barbam is the direct object: it is the thing the barber is caring for.

• barba = beard
• barbam = accusative singular of barba

Latin uses the accusative for the direct object, so barbam tells you what receives the action of curat.

Here avi is best understood as genitive singular:

• avus = grandfather
• avi = of the grandfather

So barbam avi means the grandfather’s beard or the beard of the grandfather.

A learner may notice that avi can also be dative singular in some contexts, but here the sense is possessive, so genitive is the natural reading.

Because the grandfather is not the direct object of the verb.

The sentence is not saying that the barber is caring for the grandfather directly. It is saying that he is caring for the grandfather’s beard.

So:

• avum = the grandfather as a direct object
• avi = of the grandfather (possessor)

That is why Latin uses avi, not avum.

Curat is from curo, curare, which often means care for, attend to, look after, or take care of.

In this sentence, with barbam as the object and tonsor as the subject, it has the sense of:

• tends
• grooms
• cares for
• possibly even trims or fixes up, depending on the context

So the basic meaning is that the barber is attending carefully to the grandfather’s beard.

Because it modifies the verb, not a noun.

• diligenter = carefully (adverb)
• diligens = careful (adjective)

Here the sentence tells us how the barber cares for the beard, so Latin uses the adverb diligenter.

In other words:

• tonsor diligens = a careful barber
• diligenter curat = he cares carefully

Latin often places the verb near or at the end of the sentence, although word order is more flexible than in English.

So:

• Tonsor barbam avi diligenter curat
• literally: The barber the grandfather’s beard carefully cares for

That sounds strange in English, but it is perfectly normal in Latin.

The endings tell you the grammar, so Latin does not rely on word order as heavily as English does.

Yes, often they could.

Because the case endings show the grammatical roles, Latin can move words around for emphasis or style. For example, these would still mean basically the same thing:

• Barbam avi tonsor diligenter curat.
• Diligenter tonsor barbam avi curat.
• Avi barbam tonsor curat.

However, the exact emphasis may shift a little depending on the order.

Because Latin has no definite article like English the.

So tonsor can mean:

• a barber
• the barber

and barbam can mean:

• a beard
• the beard

You decide from context which English translation is best.

Because the ending -t tells you it is third person singular.

For curare, the present tense endings include:

• curo = I care for
• curas = you care for
• curat = he/she/it cares for
• curamus = we care for
• curatis = you all care for
• curant = they care for

Since the subject is tonsor (singular), curat matches it.

Yes. Latin commonly uses the genitive after a noun to show possession.

So:

• barba avi = the grandfather’s beard
• literally: the beard of the grandfather

This is a very standard construction in Latin.

They are:

• tonsor, tonsōris = barber
• barba, barbae = beard
• avus, avi = grandfather
• diligenter = carefully
• curo, curare, curavi, curatum = care for, attend to

Knowing the dictionary form helps you recognize how each word has been changed in the sentence.

Yes: avi is the main potentially tricky form.

A beginner might wonder whether avi is:

• genitive singular = of the grandfather
• dative singular = to/for the grandfather

In this sentence, genitive singular makes the most sense because it goes naturally with barbam: the grandfather’s beard.

So the sentence structure is:

• tonsor = subject
• barbam = direct object
• avi = possessor of barbam
• diligenter = adverb
• curat = verb