La sinjorino telefonis al la teknikisto.

In Esperanto, la means the. It is used before each noun that is definite.

So:

• la sinjorino = the lady
• la teknikisto = the technician

Unlike in English, you cannot usually let one the cover two separate nouns in a sentence like this. Each definite noun normally gets its own la.

Because -o is the normal noun ending in Esperanto. All ordinary nouns end in -o, no matter whether they refer to a man, a woman, a thing, or an idea.

So in sinjorino:

• sinjor- = the idea of sir / gentleman / lady
• -in- = female
• -o = noun

That gives sinjorino = lady.

The -o does not mean masculine. It just marks the word as a noun.

-in- is a very common Esperanto suffix meaning female.

Examples:

• patro = father/parent word base in traditional usage
• patrino = mother
• frato = brother
• fratino = sister
• sinjoro = gentleman / sir
• sinjorino = lady / madam

So if you recognize -in-, you can often immediately tell that the word refers to a female person or animal.

The suffix -ist- means a person who works in, practices, or is professionally connected with something.

So:

• teknik- = technical / technique-related idea
• -ist- = practitioner, worker, specialist
• -o = noun

So teknikisto means technician.

Other examples:

• artisto = artist
• pianisto = pianist
• dentisto = dentist

Recognizing -ist- is very helpful because it appears in many job titles and roles.

Esperanto verb endings show tense very regularly:

• -as = present
• -is = past
• -os = future

So:

• telefonas = calls / is calling
• telefonis = called
• telefonos = will call

In your sentence, telefonis is past tense, so the action happened in the past.

al usually means to and often marks the person toward whom something is directed.

With telefoni, Esperanto commonly uses al for the person being called:

• Mi telefonis al ŝi. = I called her.
• Li telefonos al la kuracisto. = He will call the doctor.

So in your sentence:

• La sinjorino telefonis al la teknikisto.
• literally: The lady telephoned to the technician

That is the normal Esperanto pattern.

Because after al, you normally do not use the accusative -n.

The -n ending is often used for a direct object, but al la teknikisto is a prepositional phrase, not a direct object phrase.

So:

• telefonis al la teknikisto = called the technician / telephoned to the technician

Since al already shows the relationship, -n is not needed.

A useful rule of thumb:

• If a noun follows a preposition like al, de, kun, por, en, it usually does not take -n.

Normally, no. The standard Esperanto pattern is telefoni al iu = to phone someone.

So the usual form is:

• La sinjorino telefonis al la teknikisto.

Using telefoni directly with an accusative object is not the normal beginner-standard usage. If you are learning standard Esperanto, use al here.

Yes, Esperanto word order is fairly flexible.

You can say:

• La sinjorino telefonis al la teknikisto.
• Al la teknikisto telefonis la sinjorino.

Both are grammatical. The difference is mostly emphasis or style.

The version with La sinjorino first is the most neutral and easiest for beginners.

Because Esperanto marks relationships clearly with endings and prepositions, word order is often freer than in English.

Esperanto pronunciation is very regular. Roughly:

• te-le-fo-NIS

A few key points:

• each vowel is pronounced clearly
• stress is always on the second-to-last syllable

So:

• te-le-fo-nis → stress on fo
• actually, counting syllables carefully: te-le-fo-nis has four syllables, so stress falls on fo

Likewise:

• sinjorino → sin-jo-RI-no
• teknikisto → tek-ni-KIS-to

In Esperanto, verbs do not change according to person or number.

So:

• mi telefonas = I call
• vi telefonas = you call
• ŝi telefonas = she calls
• ili telefonas = they call

The ending stays the same. Only the tense matters:

• -as present
• -is past
• -os future

This is one of the simplest and most regular parts of Esperanto grammar.

Not necessarily. sinjorino is a polite word meaning something like lady, madam, or sometimes simply Mrs./Ms. depending on context.

It is more formal and respectful than just describing someone as a woman. The exact tone depends on the situation.

So a learner should mainly understand it as a polite adult female person, not as a word that automatically means old.

Yes.

You can say simply:

• La sinjorino telefonis. = The lady called / phoned.

If you want to add the person who received the call, you use al:

• La sinjorino telefonis al la teknikisto.

So the sentence can be complete either with or without that al phrase.