Tio estas privata demando.

Tio means that or that thing. It points to something already mentioned, understood from context, or being indicated in some general way.

So Tio estas privata demando means something like That is a private question.

A useful comparison:

• tio = that
• ĉi tio = this
• ĝi = it

Learners often confuse tio and ĝi. In many cases, tio refers to an idea, statement, or unspecified thing, while ĝi usually stands for a specific noun already established.

Estas is the present-tense form of esti, which means to be.

So:

• esti = to be
• estas = is / am / are

Esperanto uses the same present-tense verb form for all persons:

• mi estas = I am
• vi estas = you are
• li/ŝi/ĝi estas = he/she/it is
• ili estas = they are

Here, Tio estas privata demando literally follows the pattern:

That + is + a private question

In Esperanto, adjectives end in -a.

So privata means private because it is describing the noun demando.

Some examples:

• granda domo = a big house
• bona ideo = a good idea
• privata demando = a private question

Adjectives in Esperanto also agree with the noun in number and case. In this sentence, demando is singular and has no accusative ending, so privata stays in the basic form privata.

In Esperanto, nouns end in -o.

So demando is a noun meaning question.

This makes Esperanto very regular:

• -o = noun
• -a = adjective
• -e = adverb
• -i = infinitive verb

You may also notice the related verb demandi, meaning to ask. So:

• demandi = to ask
• demando = a question

That kind of word-building is very common in Esperanto.

There is no -n here because privata demando is not a direct object. It is a predicate noun phrase after estas.

In Esperanto, the accusative -n is usually used for a direct object:

• Mi demandas demandon. = I ask a question.

But after esti (to be), you normally do not use the accusative:

• Tio estas privata demando.

Here, privata demando describes what tio is, so it stays in the nominative form.

Esperanto does not have an indefinite article like English a/an.

So:

• demando can mean a question
• privata demando can mean a private question

Esperanto only has one article: la, meaning the.

So the sentence without la is naturally understood as indefinite:

• Tio estas privata demando. = That is a private question.

If you said Tio estas la privata demando, that would mean That is the private question, referring to a specific one already known.

Yes, Esperanto word order is more flexible than English, because the endings make the grammar clear.

The most neutral and natural order here is:

Tio estas privata demando.

But other orders are possible for emphasis, for example:

• Privata demando tio estas.

That sounds more marked or stylistic, not the plain everyday order. For learners, the standard order is best.

A simple pronunciation guide is:

TI-o ES-tas pri-VA-ta de-MAN-do

A few useful points:

• tio has two syllables: ti-o
• stress in Esperanto normally falls on the second-to-last syllable
• every written letter is pronounced consistently

So the stress is on:

• TI-o
• ES-tas
• pri-VA-ta
• de-MAN-do

One important detail: io in tio is not a single diphthong. You pronounce both vowels separately: ti-o.

Yes. This is a very normal Esperanto structure: adjective + noun.

• privata = private
• demando = question

So privata demando is exactly what you would expect.

Esperanto usually puts adjectives before the noun, just like English, although they can also come after the noun in some contexts:

• privata demando
• demando privata

The first version is much more ordinary and neutral.