Když píšu krátké věty, učím se rychleji.

Když means when. It introduces a subordinate clause, so Když píšu krátké věty means When I write short sentences.

In Czech, a clause starting with když is very common for talking about repeated or general situations:

• Když jsem unavený, piju kávu. = When I’m tired, I drink coffee.
• Když mám čas, čtu. = When I have time, I read.

In your sentence, it gives the condition or situation in which the second action happens.

The comma separates the subordinate clause from the main clause.

So the structure is:

• Když píšu krátké věty, = subordinate clause
• učím se rychleji. = main clause

This is normal in Czech. If a sentence begins with a clause introduced by když, a comma is expected before the main clause.

Píšu is the 1st person singular present tense of psát (to write).

So:

• píšu = I write / I am writing

Czech present tense often covers both English I write and I am writing, depending on context.

Some related forms:

• píšeš = you write
• píše = he/she writes
• píšeme = we write

Because věty here is the direct object of píšu, and it is plural.

The dictionary form is:

• věta = sentence

Here, short sentences is:

• krátké věty

This is accusative plural, and for this noun it looks the same as the nominative plural.

Breakdown:

• krátké = short, feminine plural form
• věty = sentences

So píšu krátké věty literally means I write short sentences.

Because učit se means to learn, while učit by itself usually means to teach.

So:

• učím = I teach
• učím se = I learn

The se is a reflexive particle and is part of the verb’s meaning here. You should learn učit se as a whole expression.

Examples:

• Učím češtinu. = I teach Czech.
• Učím se češtinu. = I am learning Czech.

In Czech, se often comes in the second position tendency area of its clause, but in practice learners often first memorize it with the verb.

Here:

• učím se rychleji = I learn faster

This word order is natural and standard. You may also hear Czech clitics behaving according to broader word-order rules, but for now the safest approach is to learn common patterns like:

• učím se
• dívám se
• bojím se

So in this sentence, učím se rychleji is exactly what you should expect.

Rychleji means faster.

It is the comparative form of rychle (quickly / fast):

• rychle = quickly
• rychleji = more quickly / faster

So:

• učím se rychle = I learn quickly
• učím se rychleji = I learn faster

This is an adverb, because it describes how you learn.

Normally, rychleji is the correct and natural comparative form.

Czech usually forms comparatives directly:

• rychle → rychleji
• pomalu → pomaleji
• dobře → lépe

Using something like víc rychle would sound unnatural in standard Czech. So for faster, use rychleji.

Yes, Czech word order is flexible, but the given version is the most neutral.

This sentence first gives the situation:

• Když píšu krátké věty = When I write short sentences

Then it gives the result:

• učím se rychleji = I learn faster

You could also reverse the clauses:

• Učím se rychleji, když píšu krátké věty.

That means the same thing. The difference is mainly in emphasis and flow, not basic meaning.

Often yes, but not always in a simple one-to-one way. Když can introduce:

• a time relationship: when
• a repeated situation: whenever
• sometimes a condition-like idea in everyday speech

In your sentence, it can feel like:

• When I write short sentences, I learn faster or
• Whenever I write short sentences, I learn faster

So English may vary a little depending on context.

The base noun is:

• věta = sentence

Its plural forms include:

• věty = sentences

Czech nouns change endings depending on case and number, so one word can appear in several forms. Here, because it is plural and used as the object, věty means sentences.

This is very common in Czech, so it helps to learn nouns together with their gender and some key forms:

• věta (singular)
• věty (plural)

The sentence follows this pattern:

Když + present tense clause, present tense clause.

So:

• Když píšu krátké věty, učím se rychleji.

This pattern is very useful for describing general habits or repeated situations:

• Když čtu nahlas, lépe si pamatuju. = When I read aloud, I remember better.
• Když poslouchám češtinu, víc rozumím. = When I listen to Czech, I understand more.

It is a great pattern to reuse in your own speaking and writing.

A few helpful pronunciation points:

• píšu: the í is long, and š sounds like English sh
• učím: the u here is short, č sounds like ch in church, and í is long
• se is pronounced like seh, with a short e

So roughly:

• píšu ≈ PEE-shoo
• učím se ≈ oo-CHEEM seh

Also notice the Czech accent normally falls on the first syllable of each word:

• PÍšu
• Učím
• SE

Yes. Czech present tense often covers both meanings.

So píšu can mean:

• I write
• I am writing

And učím se can mean:

• I learn
• I am learning

In this sentence, English usually sounds most natural as a general truth or habit:

• When I write short sentences, I learn faster.

But the exact English choice depends on context.