Mi vecina hornea un bizcocho de limón casi todos los sábados.

Because vecina is the feminine singular form of vecino/vecina (neighbor). It tells us the neighbor is female.

• mi vecino = my male neighbor
• mi vecina = my female neighbor

Also notice that mi does not change for masculine or feminine in the singular:

• mi vecino
• mi vecina

In Spanish, a possessive adjective like mi, tu, su, nuestro, etc. normally replaces the article.

So Spanish says:

• mi vecina = my neighbor

not:

• la mi vecina ❌

This is different from English only in form, not in meaning.

Hornea is the third person singular present indicative of hornear (to bake).

It is in the present because Spanish often uses the present tense to describe habitual actions:

• Mi vecina hornea... = My neighbor bakes...
• meaning: this is something she does regularly

The phrase casi todos los sábados makes the habitual meaning very clear.

The subject is mi vecina, and the verb form hornea matches that subject.

Hornea means he/she/it bakes or you bake (formal usted), but here the noun mi vecina tells us it means she bakes.

So:

• Mi vecina hornea = My neighbor bakes

Spanish often allows subject pronouns to be omitted, but here the subject is stated explicitly.

Un is the indefinite article (a/an) for a masculine singular noun.

• bizcocho is masculine singular
• so we use un

That gives:

• un bizcocho = a cake / a sponge cake

If it were feminine, you would expect una instead.

In Spain, bizcocho usually means a sponge cake or a simple soft cake, often homemade.

That is important because in some other Spanish-speaking regions, bizcocho can mean something different, such as a pastry or another baked item.

So for Spanish from Spain, bizcocho de limón is best understood as lemon sponge cake or lemon cake.

Spanish very often uses de + noun to describe flavor, type, material, or content.

So:

• bizcocho de limón = lemon cake
• literally: cake of lemon

This structure is extremely common:

• helado de vainilla = vanilla ice cream
• zumo de naranja = orange juice
• tarta de queso = cheesecake

So de limón is the normal and natural way to say the cake is lemon-flavored.

After de, Spanish often leaves out the article when talking about a type, ingredient, or flavor in a general way.

So:

• bizcocho de limón = lemon cake
• not normally bizcocho del limón

Using del limón would sound like you mean a specific lemon, which is not the idea here. The sentence is just describing the kind of cake.

It means almost every Saturday or nearly every Saturday.

Breakdown:

• casi = almost
• todos los sábados = every Saturday / all Saturdays

So the whole phrase means that this usually happens on Saturdays, but not absolutely every single one.

Both are possible, but they are slightly different in feel.

• todos los sábados = every Saturday / on Saturdays
• cada sábado = each Saturday / every Saturday

In everyday Spanish, todos los + day in plural is a very common way to talk about repeated actions on a day of the week:

• Voy al mercado los sábados = I go to the market on Saturdays
• Estudia todos los domingos = He studies every Sunday

Here, casi todos los sábados sounds very natural.

Because Spanish often uses the plural day name when talking about a repeated action that happens regularly on that day.

So:

• los sábados = on Saturdays / every Saturday

Compare:

• El sábado = on Saturday (one specific Saturday, depending on context)
• Los sábados = on Saturdays / every Saturday

Since the sentence describes a habit, the plural is the natural choice.

No, Spanish word order is more flexible than English word order, although this sentence uses the most neutral, common order:

• Mi vecina (subject)
• hornea (verb)
• un bizcocho de limón (object)
• casi todos los sábados (time expression)

You could also hear:

• Mi vecina hornea un bizcocho de limón casi todos los sábados.
• Casi todos los sábados, mi vecina hornea un bizcocho de limón.

Both are correct. The second version gives a little more emphasis to the time expression.

Yes. Spanish often drops subjects when the verb ending already makes the person clear.

So you could say:

• Hornea un bizcocho de limón casi todos los sábados.

This could mean She bakes a lemon cake almost every Saturday, if the context already makes clear who she is.

However, keeping mi vecina is useful when introducing the person or making the sentence clearer.

Because in Spanish, h is normally silent.

So hornea is pronounced roughly like or-NE-a.

This comes from the verb hornear. Even though the h is written, it is not pronounced in standard Spanish.

The stress is:

• hornea → ne
• bizcocho → co
• limón → món
• sábados → sá

The written accents help show the stress in limón and sábados.

A rough guide:

• hor-NE-a
• biz-CO-cho
• li-MÓN
• SÁ-ba-dos

Spanish accent marks show that the stress falls somewhere other than where the default spelling rules would predict.

• limón has stress on the last syllable: li-MÓN
• sábados has stress on the first syllable: SÁ-ba-dos

The accents are not optional; they are part of the correct spelling.

Normally, no. In Spanish, days of the week are usually written in lowercase:

• sábado
• domingo
• lunes

So casi todos los sábados is correctly written without capitals. This is different from English, where Saturday is capitalized.