Stola nova puellae placet.

Because placet does not work like English likes.

In Latin, placet means is pleasing or pleases. So the person who experiences the liking goes in the dative, not the accusative.

So the structure is:

• stola nova = the new dress/gown → the thing doing the pleasing
• puellae = to the girl → the person pleased
• placet = is pleasing

That is why Latin says something more like:

The new dress is pleasing to the girl

rather than:

The girl likes the new dress

So puellae is dative singular.

Because with placet, the thing liked is the grammatical subject.

In English, we usually say:

• The girl likes the dress

But Latin uses a different pattern:

• The dress pleases the girl

So in Stola nova puellae placet:

• stola nova is the subject
• puellae is the dative indirect object
• placet is the verb

A good way to check this is the verb ending: placet is singular, matching the singular subject stola.

Here puellae is dative singular.

A first-declension noun like puella has several forms, and puellae can mean more than one thing in isolation:

• genitive singular = of the girl
• dative singular = to/for the girl
• nominative plural = girls

But in this sentence, placet strongly suggests the dative for the person being pleased. So puellae here means to the girl.

Context and verb usage tell you which meaning is right.

Because nova is an adjective modifying stola, and Latin adjectives must agree with the nouns they describe in:

• gender
• number
• case

Here:

• stola is feminine singular nominative
• so nova must also be feminine singular nominative

That is why you get:

• stola nova = new dress/gown

If the noun changed, the adjective would change too.

Because of agreement.

Nova is feminine singular nominative here, which matches stola.

It does not match puellae in this sentence, because puellae is dative singular. If the adjective described puellae, you would expect the adjective to be in the dative too, such as novae.

So:

• stola nova = the new dress
• puellae = to the girl

The endings show which words belong together.

Classical Latin has no articles.

So Latin does not normally have separate words for:

• the
• a/an

That means stola can mean:

• a dress
• the dress

and puellae can mean:

• to a girl
• to the girl

Context tells you which is best in English.

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

So these could all mean essentially the same thing:

• Stola nova puellae placet
• Puellae stola nova placet
• Nova stola puellae placet

The endings still show:

• stola nova = subject
• puellae = dative
• placet = verb

That said, word order can affect emphasis. For example, putting puellae first might emphasize to the girl.

Because its subject, stola, is singular.

Placet is the third person singular present tense of placere.

So:

• stola ... placet = the dress pleases

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

• Stolae novae puellae placent = The new dresses please the girl

The verb agrees with the subject, not with puellae.

By form alone, stola could in some contexts be nominative singular or ablative singular.

But in this sentence, it makes sense as the nominative singular subject because:

• placet needs a subject
• nova matches stola
• puellae is already functioning as the dative with placet

So syntactically, stola nova is clearly the subject phrase here.

A very literal layout is:

• Stola nova = the new dress
• puellae = to the girl
• placet = is pleasing

So the sentence follows this pattern:

[thing that pleases] + [person in the dative] + [placet]

This is a very common Latin pattern with placet and similar verbs, and it is worth getting used to because it differs from normal English phrasing.