Magistra maxime clara voce loquitur.

Magistra is the subject of the sentence, so it is in the nominative singular.

• magistra = teacher (female teacher, or grammatically feminine teacher)
• nominative singular is the normal form for the subject

So magistra ... loquitur means the teacher ... speaks.

Yes, magistra is the feminine form. The masculine equivalent would be magister.

So:

• magister = male teacher
• magistra = female teacher

In a simple sentence like this, Latin is telling you that the teacher is grammatically feminine.

Maxime is an adverb, and here it means something like very, most, or especially depending on context.

In this sentence it intensifies clara:

• clara voce = with a clear voice
• maxime clara voce = with a very clear voice / with an extremely clear voice

So maxime is making the idea of clarity stronger.

Because clara is an adjective describing voce, and Latin adjectives must agree with the nouns they modify in:

• gender
• number
• case

Here:

• voce is ablative singular feminine
• clara is also ablative singular feminine

That agreement shows that clara belongs with voce: with a clear voice.

This is the ablative of manner or a closely related use of the ablative expressing how something is done.

So clara voce means:

• with a clear voice
• in a clear voice

Latin often uses the ablative for this kind of idea.

Good question. With an ablative of manner, Latin often uses cum, especially when there is no adjective:

• cum voce = with a voice

But when the noun has an adjective, Latin often omits cum:

• clara voce = with a clear voice

So clara voce is completely normal Latin. You may also see cum clara voce, but the version without cum is very common when an adjective is present.

Because loquitur comes from a deponent verb.

A deponent verb has:

• passive forms
• but an active meaning

So:

• loquitur looks like he/she is spoken
• but actually means he/she speaks

The dictionary form is loquor, loqui, locutus sum = to speak.

This is one of the first important things learners notice in Latin: not every passive-looking verb is actually passive in meaning.

Loquitur is:

• third person singular
• present tense

So it means:

• he speaks
• she speaks
• it speaks

In this sentence, since the subject is magistra, it means she speaks or the teacher speaks.

Most naturally, maxime modifies the idea of clarity, so:

• maxime clara voce = with a very clear voice

In other words, it is intensifying the phrase clara voce.

A learner might wonder whether it means speaks very much clearly, but the simplest reading is that the voice is being described as especially clear.

The words are:

• Magistra = subject
• maxime clara voce = phrase describing manner
• loquitur = verb

A very literal arrangement is:

• The teacher with a very clear voice speaks

But natural English would usually be:

• The teacher speaks with a very clear voice

Latin word order is much more flexible than English word order, because the endings show the grammatical relationships.

Possibly in some contexts, but that is not the most direct grammatical reading.

Why?

• maxime is an adverb
• clara voce is a noun phrase in the ablative: with a clear voice

So the sentence is built around voice, not just the adverb clearly.

That is why a translation like The teacher speaks with a very clear voice is usually better than The teacher speaks most clearly.

Yes. Latin often uses vox and related ablative phrases to describe the way someone speaks:

• magna voce = with a loud voice
• alta voce = in a loud voice / aloud
• clara voce = with a clear voice

So this kind of expression is very natural in Latin.

Yes. Maxime can mean most, very greatly, or especially, depending on context.

But in this sentence, with clara voce, the most natural sense is intensification:

• very clear
• extremely clear

So here especially clear voice is less likely than very clear voice.