In illa silva umbra tam densa est ut etiam meridie frigus parvum sentiatur.

Because in with the ablative usually means in / on / within a place, showing location rather than motion.

• silva = forest
• illa = that
• silva is ablative singular feminine
• illa matches it, so it is also ablative singular feminine

So in illa silva means in that forest.

If there were motion into the forest, Latin would normally use in with the accusative instead.

Illa is the feminine form of ille, illa, illud, which can mean that.

It agrees with silva in:

• gender: feminine
• number: singular
• case: ablative

So illa silva literally means that forest.

In context, illa may simply point out a particular forest already known in the discussion, much like English that forest.

No. In Latin, just as in English, a singular noun can refer to something general or mass-like.

umbra can mean:

• shadow
• shade
• sometimes the general condition of being shaded

So umbra tam densa est means the shade is so thick/dense. The singular works naturally here.

Densa is an adjective agreeing with umbra.

Since umbra is:

• feminine
• singular
• nominative

the adjective must also be:

• feminine
• singular
• nominative

So:

• umbra densa = dense shade

Because it comes with est, this is a predicate adjective:

• umbra ... densa est = the shade is dense

Tam ... ut means so ... that.

It introduces a result clause:

• tam densa est = is so dense
• ut ... sentiatur = that ... is felt

So the structure is:

• umbra tam densa est ut...
• the shade is so dense that...

This is a very common Latin pattern.

It is a result clause, not a purpose clause.

The clue is tam.

Latin often uses:

• tam = so
• ut = that

Together they signal a result:

• so dense that even at noon a slight chill is felt

A purpose clause would usually express intention, like in order that. This sentence is not about intention; it is about what happens as a consequence.

Because it is in a result clause introduced by ut after tam.

In Latin, result clauses normally take the subjunctive. So:

• sentiatur = may be felt / is felt in a result-clause sense

Even though English usually uses the indicative in translation (that a slight chill is felt), Latin uses the subjunctive because of the clause type.

Sentiatur is the present subjunctive passive of sentire.

Here it literally means:

• is felt
• or more naturally in English, can be felt

Latin often uses the passive in a way that sounds quite natural:

• frigus parvum sentiatur = a slight chill is felt

An active version would need a subject such as someone:

• ut aliquis frigus parvum sentiat = so that someone feels a slight chill

But the passive is smoother and more impersonal here.

Meridie is the ablative singular of meridies, meaning midday, noon, or the south depending on context.

Here it means at midday or at noon.

This is an example of the ablative of time when:

• meridie = at midday

So:

• etiam meridie = even at noon

Etiam means even.

By putting it before meridie, Latin emphasizes the time phrase:

• even at noon

This makes good sense, because noon is normally the warmest part of the day. The sentence is stressing how unusually deep the shade is.

Literally, it means a small cold or a slight chill.

• frigus is a neuter noun meaning cold, coolness, or chill
• parvum is the neuter singular adjective small/slight, agreeing with frigus

In better English, a slight chill is usually the most natural translation.

Because parvum must agree with frigus.

Frigus is:

• neuter
• singular
• nominative here

So the adjective must also be:

• neuter
• singular
• nominative

Hence parvum.

The sentence breaks down like this:

Main clause:

• In illa silva umbra tam densa est
• In that forest the shade is so dense

Subordinate result clause:

• ut etiam meridie frigus parvum sentiatur
• that even at noon a slight chill is felt

A useful way to see it is:

• tam in the main clause points forward to
• ut in the subordinate clause

Not really. It is quite natural Latin word order.

A rough structure is:

• In illa silva = setting/place
• umbra = subject
• tam densa est = predicate
• ut etiam meridie = beginning of result clause
• frigus parvum sentiatur = rest of result clause

Latin word order is more flexible than English because case endings show the grammatical relationships. So Latin can arrange words for emphasis and rhythm more freely.

Yes, literally that is fine. But in idiomatic English, the shade is so dense/thick sounds more natural here than the shadow.

Latin umbra can cover both ideas:

• a specific shadow
• general shade

Because the context is a forest, shade is usually the better English choice.

• est is present indicative of esse: is
• sentiatur is present subjunctive passive of sentire: is felt / may be felt

Both are present because the sentence describes a general present situation:

• the shade is dense
• a slight chill is felt

The difference is not mainly about time, but about mood:

• est is in the main statement
• sentiatur is in a result clause, so it is subjunctive