Mi hermano habla en voz alta en clase para llamar la atención.

Habla is the present simple form of hablar for él/ella/usted.

In Spanish, the present tense often covers both:

• he speaks
• he is speaking

So Mi hermano habla en voz alta can mean either:

• My brother speaks loudly
• My brother is speaking loudly

If you want to be more explicitly progressive, Spanish can also use:

• Mi hermano está hablando en voz alta

But in many everyday sentences, the simple present is completely natural.

Spanish often leaves out subject pronouns because the verb ending already tells you who the subject is.

Here, habla tells you the subject is:

• he
• she
• you formal

Since the sentence already has Mi hermano, adding él would usually be unnecessary:

• Mi hermano habla... = normal
• Él habla... = possible, but only if you want emphasis or contrast

This is very common in Spanish.

Both are possible in Spanish, but mi hermano is the normal and most natural way to say my brother.

• mi hermano = standard, everyday possessive
• el hermano mío = much less common, more emphatic or stylistically marked

For basic possession, Spanish usually puts the possessive before the noun:

• mi casa
• tu libro
• nuestro profesor

So mi hermano is exactly what you would expect here.

Literally, en voz alta means something like in a high/loud voice.

Spanish often uses this fixed expression where English uses the adverb loudly:

• hablar en voz alta = to speak out loud / loudly
• leer en voz alta = to read aloud

This is a very common phrase. Even though Spanish does have words like fuertemente or alto in other contexts, en voz alta is the natural expression for speaking or reading out loud.

Sometimes you may hear hablar alto, and people will understand it, but hablar en voz alta is generally the clearer and more standard expression for speaking out loud / loudly.

So for learners, the safest choice is:

• hablar en voz alta

Compare:

• Mi hermano habla en voz alta = very natural
• Mi hermano habla alto = understandable, but less neutral in many contexts

If you are learning standard Spanish, especially for Spain, en voz alta is the expression to remember.

In Spanish, en clase often means in class / during class as a general activity or setting, not necessarily a specific physical classroom.

So:

• en clase = in class / during class
• en la clase = in the classroom or in the specific class

In this sentence, en clase sounds natural because the idea is that he does this during class.

Examples:

• No hables en clase. = Don’t talk in class.
• Dejé el libro en la clase. = I left the book in the classroom.

This is para + infinitive, a very common structure in Spanish used to express purpose.

So:

• para = in order to / to
• llamar = infinitive, to call
• la atención = attention

Together:

• para llamar la atención = to attract attention / to get attention

This works just like:

• Estudio para aprender. = I study to learn.
• Fue al supermercado para comprar pan. = He/She went to the supermarket to buy bread.

Because llamar la atención is a fixed Spanish expression.

Literally, it looks like to call the attention, but in real use it means:

• to attract attention
• to get attention
• sometimes to catch someone’s attention

Spanish often keeps the article in expressions where English does not.

So you should learn it as a chunk:

• llamar la atención

Examples:

• Ese color llama la atención. = That colour attracts attention.
• Hace tonterías para llamar la atención. = He does silly things to get attention.

Because Spanish normally uses la atención as an uncountable idea, much like English often uses attention without a plural.

So:

• llamar la atención = to attract attention

Spanish does not usually say las atenciones in this meaning.

The plural atenciones exists, but it means something different, more like:

• kind attentions
• courtesies
• attentive gestures

So in this sentence, singular atención is exactly right.

Yes, Spanish word order is fairly flexible, but the original order is natural and clear.

The sentence is:

• Mi hermano habla en voz alta en clase para llamar la atención.

This flows as:

1. subject: Mi hermano
2. verb: habla
3. manner: en voz alta
4. place/context: en clase
5. purpose: para llamar la atención

You could move some parts for emphasis:

• En clase, mi hermano habla en voz alta para llamar la atención.
• Para llamar la atención, mi hermano habla en voz alta en clase.

These are grammatical, but the original version is the most neutral.

Because llamar la atención is the idiomatic expression Spanish normally uses for getting/attracting attention.

Other verbs may be possible in certain contexts:

• atraer la atención = to attract attention
• captar la atención = to capture attention

But llamar la atención is the most common everyday phrase, especially when talking about someone behaving in a noticeable way so people look at them.

So in this sentence, it sounds very natural.

Usually it means during class or in class as an activity/context. It does not focus only on physical location.

So:

• Mi hermano habla en voz alta en clase normally suggests he speaks loudly while class is going on

If you wanted to stress the physical room more, you might say:

• en el aula
• en la clase, depending on context

But en clase is the normal expression for school situations like this.

No. In standard Spanish, the h is silent.

So hermano is pronounced roughly like ermano.

That is true for most words with h:

• hola
• hacer
• hermano

A common exception for learners to notice is that ch is different, because it is a separate sound:

• chico

But in hermano, the h itself is silent.