Mi hermana siempre busca su llavero en el recibidor antes de salir.

Mi hermana is the normal, neutral way to say my sister in Spanish.

Spanish usually puts possessive words like mi, tu, su, nuestro before the noun:

• mi hermana
• tu casa
• su coche

A structure like la hermana mía does exist, but it is much less common here and usually sounds more emphatic, literary, or contrastive. In everyday speech, mi hermana is the natural choice.

In Spanish, adverbs like siempre often go before the conjugated verb:

• siempre busca
• nunca come carne
• a menudo llega tarde

So Mi hermana siempre busca... is a very natural word order.

You can sometimes move siempre for emphasis, for example:

• Mi hermana busca siempre su llavero...

But that is less neutral. The original sentence sounds more standard and natural.

Busca comes from the verb buscar, which means to look for.

So here, busca su llavero means she looks for her keychain / keyring.

This is important because buscar does not mean to find.
Compare:

• buscar = to look for
• encontrar = to find

So:

• Mi hermana busca su llavero = My sister looks for her keychain
• Mi hermana encuentra su llavero = My sister finds her keychain

The simple present in Spanish often covers what English says with either:

• looks for
• is looking for

In this sentence, busca is being used for a habitual action: something she regularly does before leaving.

So siempre busca means she always looks for or she is always looking for, depending on context. In English, always looks for fits best because it describes a repeated routine.

Su can mean several things:

• his
• her
• your (formal)
• their

Spanish uses the same form for all of these, so context tells you whose object it is.

In Mi hermana siempre busca su llavero..., the most natural reading is that su llavero means her keychain, because the sentence is about my sister.

If needed, Spanish can clarify:

• el llavero de mi hermana = my sister’s keychain
• su propio llavero = her own keychain

But in normal speech, su llavero is completely fine.

Spanish often uses possessives when ownership matters or when introducing the object clearly.

Here, su llavero emphasizes that it is her keychain. That sounds natural because she is looking for a specific personal object.

You could hear el llavero in some contexts if ownership is already very obvious, but su llavero is the most straightforward and natural version in this sentence.

Llavero usually means keychain or keyring.

It comes from llave = key.

Depending on context, llavero can refer to:

• the ring holding the keys
• the keychain as a whole, including the keys
• sometimes a key holder

In this sentence, the natural meaning is her keychain / keys.

En el recibidor means in the hall / in the entryway / in the foyer.

The preposition en is used because this gives the location where she looks for the keychain.

Compare:

• en el recibidor = in the hall / entryway
• al recibidor = to the hall / toward the hall

So:

• busca su llavero en el recibidor = she looks for her keychain in the hall
• va al recibidor = she goes to the hall

It is very common in Spain Spanish. Recibidor refers to the entrance area of a home, the small hall or space just inside the front door.

Depending on the region or country, people might also say:

• la entrada
• el hall
• el vestíbulo (more formal)

For Spanish from Spain, recibidor is a very natural choice in a sentence like this.

After antes, Spanish uses de before an infinitive.

So:

• antes de salir = before leaving
• antes de comer = before eating
• antes de dormir = before sleeping

This is a fixed pattern:

• antes de + infinitive

Without de, it would be incorrect here.

The understood subject of salir is the same as the subject of the main verb: mi hermana.

So the sentence means:

• My sister always looks for her keychain in the hall before she leaves

Spanish often leaves this kind of subject unspoken when it is obvious from context.

Because after antes de, Spanish normally uses the infinitive when the subject is understood or general.

So:

• antes de salir = before leaving
• antes de entrar = before entering
• antes de acostarse = before going to bed

If Spanish wants to introduce a different subject, it often uses a different structure, for example:

• antes de que ella salga = before she leaves

But in your sentence, the simpler infinitive structure is the natural one.

Spanish is a pro-drop language, which means subject pronouns are often omitted when the verb form already shows the person.

Since busca clearly matches él/ella/usted, and the subject Mi hermana is already stated, there is no need to add ella.

So:

• Mi hermana siempre busca... = natural
• Mi hermana ella siempre busca... = not correct in normal usage

You might use ella only for strong emphasis or contrast, but not in a basic sentence like this.

Yes, some changes are possible, but they may sound less neutral or add emphasis.

For example:

• Mi hermana siempre busca su llavero en el recibidor antes de salir. = neutral
• Mi hermana busca siempre su llavero... = possible, but less common
• Antes de salir, mi hermana siempre busca su llavero en el recibidor. = also natural, with emphasis on the time sequence

Spanish word order is flexible, but the original sentence is a very standard, natural arrangement.

Busca is the third person singular form of buscar in the present tense.

Present tense of buscar:

• yo busco
• tú buscas
• él / ella / usted busca
• nosotros buscamos
• vosotros buscáis
• ellos / ellas / ustedes buscan

Since the subject is mi hermana, the correct form is busca.

The personal a is used before specific people (and sometimes pets or personified beings), not before ordinary objects.

So:

• Veo a mi hermana = I see my sister
• Busco a mi hermano = I’m looking for my brother

But:

• Busco su llavero = I’m looking for her keychain

Because llavero is a thing, there is no personal a.