Puer dicit aliquid in cista latere.

Because after dicit (the boy says), Latin often uses an indirect statement construction rather than a clause introduced by that.

In English, we say:

• The boy says that something is hiding / hidden in the box.

In Latin, this is commonly expressed as:

• Puer dicit aliquid in cista latere.

Here:

• dicit = says
• aliquid ... latere = something to be hidden / that something is hidden

So latere is infinitive because it belongs to an accusative-and-infinitive construction, which is very common after verbs of saying, thinking, knowing, hearing, and so on.

The subject of latere is aliquid.

In indirect statement, Latin normally puts the subject of the infinitive in the accusative case. Here, aliquid is the thing that is said to be hidden.

So the structure is:

• Puer dicit = the boy says
• aliquid latere = that something is hidden

A useful thing to notice is that aliquid is neuter singular, and its nominative and accusative forms look the same, so you do not see a visible change here even though it functions as the accusative subject of the infinitive.

Because aliquid is the common neuter singular form of the indefinite pronoun meaning something when it stands on its own.

Compare:

• aliquid = something
• aliquod verbum = some word

So:

• when the word is used by itself, Latin usually uses aliquid
• when it is used with a noun, Latin can use an agreeing adjective form such as aliquod

In this sentence, aliquid stands alone, so aliquid is the natural form.

Latere means to lie hidden, to be hidden, or sometimes simply to be concealed.

This can feel slightly strange to an English speaker, because English often says:

• something is hidden
• something is hiding

Latin lateo, latere is an active verb in form, but its meaning is often more like be hidden rather than hide something.

So here aliquid in cista latere means:

• that something is hidden in the box
• or that something is hiding in the box

depending on the context and the translation style.

This is a very good vocabulary question.

• lateo, latere = to be hidden, to lie concealed
• celo, celare = to hide something, to conceal something

So:

• aliquid latet = something is hidden
• puer aliquid celat = the boy hides something

In other words:

• latere describes the state of being hidden
• celare usually describes the action of hiding an object

That is why latere fits well in this sentence.

Because in takes different cases depending on the meaning:

• in + ablative = in/on with the idea of location
• in + accusative = into/onto with the idea of motion toward

Here the meaning is location:

• in cista = in the box

It does not mean movement into the box. It means that the thing is already there, hidden there.

So:

• aliquid in cista latet = something is hidden in the box
• but aliquid in cistam cadit would mean something falls into the box

Cista is ablative singular, because it follows in in the sense of location.

Its dictionary form is:

• cista, cistae, feminine = box, chest

Basic forms:

• nominative singular: cista
• accusative singular: cistam
• ablative singular: cista

So in in cista, the ablative is used because the meaning is in the box.

Yes, cista is a regular noun meaning box, chest, or basket/container, depending on context.

It is a first-declension feminine noun:

• cista
• cistae

For a learner, the important thing here is simply that it behaves like a normal first-declension noun, so in cista is exactly the sort of ablative singular form you would expect.

Because Latin very often does not use a that-clause after verbs like say, think, know, hear, and see. Instead, it prefers the accusative + infinitive construction.

So English says:

• The boy says that something is hidden in the box.

Latin says:

• Puer dicit aliquid in cista latere.

This is one of the biggest differences between English and Latin syntax, and it is something learners see again and again.

Yes. Latin word order is much freer than English word order because the endings show the grammatical relationships.

So these would still mean essentially the same thing:

• Puer dicit aliquid in cista latere.
• Aliquid puer dicit in cista latere.
• In cista aliquid puer dicit latere.

However, the chosen word order can affect emphasis.

The given order is fairly straightforward:

• Puer introduces the speaker
• dicit gives the main action
• aliquid in cista latere gives what he says

So it is a clear, natural teaching example.

Yes. Puer is the subject of dicit.

So the main clause is:

• Puer dicit = The boy says

Then the rest of the sentence, aliquid in cista latere, is what the boy says.

It helps to divide the sentence into two layers:

1. Main statement:

   • Puer dicit = The boy says

2. Indirect statement:

   • aliquid in cista latere = that something is hidden in the box

In many contexts aliquid means something, while anything is more often expressed by words such as quidquam or quicquam, especially in negative or conditional contexts.

Here, in a simple affirmative statement, aliquid is best understood as:

• something

So the sentence means that the boy says there is some unidentified thing hidden in the box.

The dictionary form is usually given as:

• lateo, latere, latui

meaning to lie hidden, be hidden, or escape notice

In the sentence, you see the present active infinitive form:

• latere

That is the form required by the indirect statement after dicit.

A direct version would use a normal finite verb:

• Aliquid in cista latet.
• Something is hidden in the box.

When this becomes indirect after dicit, Latin changes the finite verb to an infinitive:

• direct: Aliquid in cista latet.
• indirect after dicit: Puer dicit aliquid in cista latere.

This is a very useful transformation to learn, because it appears constantly in Latin.