Ne parolu laŭte en la biblioteko.

In Esperanto, -u is the ending for the volitive form, which is used for commands, requests, instructions, and wishes.

So:

• paroli = to speak
• parolas = speaks / is speaking
• parolu = speak! / do speak

In this sentence, Ne parolu means Don’t speak.

The -u form is used whether the command is direct, polite, or general. Esperanto does not have a separate imperative form like English does; the -u form covers that job.

Ne is the normal Esperanto word for not, and it usually comes directly before the word it negates.

So:

• Parolu! = Speak!
• Ne parolu! = Don’t speak!

This is very straightforward in Esperanto: put ne before the verb to make it negative.

It can be either.

Esperanto’s -u verb form does not change depending on whether you are speaking to one person or several people.

So Ne parolu can mean:

• Don’t speak (to one person)
• Don’t speak (to several people)

If you want, you can add a subject for clarity:

• Vi ne parolu. = You should not speak / Don’t speak.

But in commands, the subject is usually omitted because it is understood.

In Esperanto, just as in English, commands often leave out the subject because it is understood.

English says:

• Don’t speak loudly in the library.

not usually:

• You, don’t speak loudly in the library.

Esperanto works the same way:

• Ne parolu laŭte en la biblioteko.

The listener understands that the speaker is addressing them.

Laŭte is an adverb, and the -e ending marks adverbs in Esperanto.

It comes from the root laŭt-, which relates to loudness:

• laŭta = loud (adjective)
• laŭte = loudly (adverb)

Since it describes how someone speaks, the adverb form is used:

• parolu laŭte = speak loudly

This is one of the most regular parts of Esperanto:

• adjectives end in -a
• adverbs end in -e

A helpful approximate pronunciation is LOW-teh.

More specifically:

• laŭ sounds like the lau in loud
• te is pronounced teh

So laŭte is roughly LOW-teh.

A key point is that ŭ is a very short sound, like a w-like glide, not a full vowel of its own. It appears in combinations like aŭ and eŭ.

La means the.

So:

• en la biblioteko = in the library

In this sentence, the speaker probably means a specific kind of place understood by everyone: the library as a known public space or the library you are in.

Esperanto uses la when something is definite, much like English does.

You could say en biblioteko in some contexts, but it would sound more like in a library. That is less natural here if the sentence is a rule or instruction about a particular place.

Because en is a preposition. Prepositions in Esperanto do not take endings like nouns, adjectives, and verbs do.

Here:

• en = in
• la biblioteko = the library

So en la biblioteko literally means in the library.

The noun biblioteko has the normal noun ending -o, and because it is the object of a preposition, it does not need -n here.

The -n ending usually marks the direct object of a verb, and it can also mark direction in some expressions.

But in this sentence, biblioteko is not a direct object. It is part of a prepositional phrase:

• en la biblioteko = in the library

Since en already shows the relationship, no -n is needed here.

Compare:

• Mi estas en la biblioteko. = I am in the library.
• Mi iras en la bibliotekon. = I go into the library.

In the second sentence, -n can show movement into a place.

Yes, that is possible.

Esperanto word order is fairly flexible, because endings do a lot of the grammatical work. So both of these are understandable:

• Ne parolu laŭte en la biblioteko.
• Ne laŭte parolu en la biblioteko.

However, Ne parolu laŭte en la biblioteko is the most neutral and natural order for most learners to start with.

The usual idea is:

• Ne parolu = don’t speak
• laŭte = loudly
• en la biblioteko = in the library

It can be either, depending on tone and context.

The Esperanto -u form does not itself tell you whether something is harsh, neutral, polite, or formal. It simply gives a command/request/instruction.

So:

• Parolu. can mean Speak, Please speak, or Do speak, depending on context.
• Ne parolu. can mean Don’t speak, Please don’t speak, or Do not speak.

If you want to sound softer, you can add words such as:

• Bonvolu ne paroli laŭte en la biblioteko. = Please do not speak loudly in the library.

But the basic sentence is perfectly normal for a sign, rule, or instruction.

Because parolas is not a command form.

• parolas = speaks / is speaking
• parolu = speak! / should speak

So:

• Li ne parolas. = He is not speaking.
• Ne parolu! = Don’t speak!

If you used ne parolas by itself, it would describe a fact, not give an instruction.

No. It is the natural word for loudly, but there are other ways to express similar ideas depending on nuance.

For example:

• Ne parolu laŭte = Don’t speak loudly.
• Parolu mallaŭte = Speak quietly / softly.
• Ne bruu = Don’t make noise.

But for the exact meaning Don’t speak loudly in the library, Ne parolu laŭte en la biblioteko is a very good, standard sentence.