Vita casta matri placet.

Because vita is in the nominative singular, which is the case normally used for the subject.

Here, vita means life and is the thing doing the verb action in Latin terms: it is the thing that pleases.

So in Vita casta matri placet, the basic structure is:

• vita = the subject, life
• placet = pleases
• matri = to the mother

Literally, the sentence works like:

A chaste life pleases the mother.

Casta is an adjective modifying vita, so it must agree with vita in:

• gender
• number
• case

Since vita is feminine nominative singular, casta is also feminine nominative singular.

So:

• vita = feminine nominative singular
• casta = feminine nominative singular

That is standard Latin adjective agreement.

Matri is the dative singular of mater, meaning to/for the mother.

The verb placet works differently from English pleases or likes. In Latin, the person who experiences the pleasure is put in the dative case.

So Latin says:

• vita ... placet matri = life pleases to the mother

Natural English turns that into:

• the mother likes life
• or more literally, life pleases the mother

If Latin used mater, that would be nominative and would suggest the mother was the subject, which is not the meaning here.

Placet comes from placeo, placere, which means to please.

Its pattern is usually:

• the thing that is pleasing = nominative
• the person pleased = dative

So in this sentence:

• vita casta = the thing that is pleasing
• matri = the person pleased

This is a very common point for English speakers, because English often says someone likes something, but Latin often says something pleases someone.

Compare:

• Puella puero placet = The girl pleases the boy / The boy likes the girl
• Vita casta matri placet = A chaste life pleases the mother / The mother likes a chaste life

Because its subject is singular: vita.

Since vita casta means a chaste life, that whole subject is singular, so the verb must also be singular:

• vita ... placet = life pleases

If the subject were plural, the verb would be plural too:

• vitae castae matri placent = chaste lives please the mother

The dictionary forms are:

• vita → vita, vitae = life
• casta → castus, casta, castum = chaste, pure, morally clean
• matri → from mater, matris = mother
• placet → from placeo, placere, placui = to please

A learner may need to recognize that the word appearing in the sentence is often not the dictionary form, especially with nouns and verbs.

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

So vita casta can mean:

• a chaste life
• the chaste life
• sometimes just chaste life

Which one sounds best depends on context. If your translation gives a chaste life or the chaste life, both may be acceptable depending on the situation.

The core meaning does not depend heavily on the word order, because the case endings show each word’s role.

So these could all mean roughly the same thing:

• Vita casta matri placet
• Matri vita casta placet
• Casta vita matri placet

The endings tell us:

• vita is nominative, so it is the subject
• matri is dative, so it is the person pleased

That said, word order in Latin can affect emphasis and style. The given order is straightforward and natural.

Yes. That is a perfectly natural English translation.

Strictly speaking, Latin says:

• A chaste life pleases the mother

But in idiomatic English, we often prefer:

• The mother likes a chaste life

Both express the same basic meaning. A learner should still remember the Latin construction with placet + dative, because that is how the grammar works.

It describes vita, not matri.

You can tell by agreement:

• vita is feminine nominative singular
• casta is also feminine nominative singular

But matri is dative singular, so casta cannot be modifying matri in this sentence.

Latin often lets you identify which words go together by matching endings, not just by word order.

• vita is a first-declension noun: vita, vitae
• mater is a third-declension noun: mater, matris

That is why their endings look different:

• first declension dative singular is usually -ae
• third declension dative singular is often -i

So:

• vita could become vitae in the dative
• mater becomes matri in the dative

This is a useful sentence because it shows two different declensions together.

In a common classroom pronunciation, you could say it roughly as:

WEE-ta KAS-ta MA-tree PLA-ket

In restored classical pronunciation:

• v sounds like w
• c is always hard, like k
• ae usually sounds like ai in aisle
• ti in vita is just ti, not English sh

So a more classical approximation is:

WEE-ta KAS-ta MA-tree PLA-ket

The stress is:

• VÍ-ta
• CÁS-ta
• MÁ-tri
• PLÁ-cet

Probably these three points:

1. Adjectives agree with nouns

   • vita casta: both are feminine nominative singular.

2. Placet takes a dative person

   • matri = to the mother.

3. Latin often expresses liking as pleasing

   • Vita casta matri placet literally = A chaste life pleases the mother.

If you remember those, you have learned the main grammar of the sentence.