A veces aprendo las palabras de memoria.

A veces means sometimes.

It is a fixed expression in Spanish. Literally, it comes from the idea of at times or on some occasions, which is why veces is plural.

You will hear:

• A veces = sometimes
• Muchas veces = many times / often
• Pocas veces = few times / not often

So even though English uses a single word, Spanish uses this set phrase.

Aprendo is the first-person singular present tense of aprender.

So:

• aprender = to learn
• aprendo = I learn

In this sentence, the speaker is talking about what they do sometimes, so the present tense is natural.

A quick breakdown:

• yo aprendo = I learn
• tú aprendes = you learn
• él/ella aprende = he/she learns

Spanish often drops the subject pronoun, so aprendo by itself already means I learn.

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

Here, aprendo clearly means I learn, so yo is not necessary.

Both are correct:

• A veces aprendo las palabras de memoria.
• A veces yo aprendo las palabras de memoria.

But the version without yo sounds more natural in many situations. You would usually add yo only for emphasis, contrast, or clarity.

Spanish often uses the definite article more than English does.

Here, las palabras can mean:

• the words
• or more generally words/vocabulary words, depending on context

Using las makes the noun sound more specific or more natural as a direct object in this kind of sentence.

In English, we might say:

• I memorize words but in Spanish it is very common to say:
• aprendo las palabras de memoria

So this is not always translated word-for-word.

De memoria means from memory or by heart.

It is a very common Spanish expression used when someone memorizes something rather than understanding it deeply or reading it in front of them.

Examples:

• Aprender algo de memoria = to learn something by heart
• Decir algo de memoria = to say something from memory
• Saber algo de memoria = to know something by heart

It is best learned as a set phrase.

Because de memoria is the standard idiomatic expression in Spanish.

Languages often use different prepositions in fixed expressions, and this is one of them. Even if from memory or by heart does not match perfectly word-for-word, Spanish uses de here.

So you should memorize:

• aprender de memoria
• decir de memoria
• saber de memoria

Using en memoria would usually sound wrong in this context.

They are very similar, but not always identical in feel.

• Aprender de memoria = to learn by heart / to memorize
• Memorizar = to memorize

Memorizar is a straightforward verb meaning to memorize.

Aprender de memoria is a very common, natural expression and can sometimes emphasize the process of learning something by rote.

Depending on context, they may be interchangeable:

• A veces memoriza las palabras.
• A veces aprende las palabras de memoria.

But aprender de memoria often carries a slight sense of rote learning, not just memory in general.

It usually suggests memorization, possibly without full understanding.

When someone says they learn something de memoria, it often implies they are remembering it mechanically or by repetition.

For example, it can suggest:

• learning vocabulary by repetition
• memorizing lines
• studying for a test by rote

So compared with just aprendo las palabras, adding de memoria shifts the idea toward memorizing rather than simply learning in a broader sense.

Yes. A veces is flexible.

You can say:

• A veces aprendo las palabras de memoria.
• Aprendo las palabras de memoria a veces.

The first version is more natural and common when introducing the idea of sometimes right away.

Putting a veces at the end is possible, but it may sound a little less neutral depending on context. In general, adverbs like this often appear at the beginning of the sentence in everyday Spanish.

Yes, but the meaning shifts slightly.

• las palabras = the words / the vocabulary words
• el vocabulario = vocabulary

If you say:

• A veces aprendo el vocabulario de memoria,
  that sounds like Sometimes I memorize the vocabulary.

If you say:

• A veces aprendo las palabras de memoria,
  that sounds more like memorizing specific words.

So both are possible, but las palabras feels more concrete and item-by-item.

The base noun is la palabra = word, which is feminine.

So:

• la palabra = the word
• las palabras = the words

That is why the article is las, not los.

This is just normal noun agreement:

• feminine singular: la palabra
• feminine plural: las palabras

It is most naturally understood as a habitual action.

Because the sentence begins with a veces (sometimes), the present tense aprendo means something like:

• Sometimes I learn/memorize words by heart

So it is not mainly about what is happening at this exact moment. It describes something the speaker does on some occasions.

This is very common in Spanish:

• A veces estudio por la noche.
• A veces como tarde.
• A veces aprendo las palabras de memoria.

In all of these, the present tense describes a repeated or usual behavior.