La terapiisto rehabilitas la pacienton.

La is the definite article in Esperanto, meaning the. It does not change for gender, number, or case.

So:

• la terapiisto = the therapist
• la pacienton = the patient

Esperanto has no indefinite article, so there is no separate word for a or an. If you wanted a therapist rehabilitates a patient, you could simply say Terapiisto rehabilitas pacienton.

The suffix -ist- refers to a person connected with a profession, activity, or system. It often means someone who practices something professionally or habitually.

So:

• terapio = therapy
• terapiisto = therapist

This is a very common Esperanto pattern. For example:

• piano → pianisto = pianist
• arto → artisto = artist

The -n ending marks the direct object of the verb.

In this sentence:

• La terapiisto is the person doing the action, so it is the subject
• la pacienton is the person receiving the action, so it is the direct object

That is why Esperanto uses:

• La terapiisto rehabilitas la pacienton.

Without the -n, la paciento would look like another subject instead of the object.

Yes, in normal Esperanto grammar, the direct object takes -n.

Examples:

• Mi vidas la hundon. = I see the dog.
• Ŝi amas la muzikon. = She loves the music.
• La terapiisto rehabilitas la pacienton. = The therapist rehabilitates the patient.

This object marking is very useful because it makes sentence roles clear even if the word order changes.

The ending -as marks the present tense in Esperanto.

So rehabilitas means rehabilitates, is rehabilitating, or sometimes does rehabilitate, depending on context.

A key point for English speakers: Esperanto verbs do not change according to the subject.

So you get:

• mi rehabilitas = I rehabilitate / am rehabilitating
• li rehabilitas = he rehabilitates / is rehabilitating
• ili rehabilitas = they rehabilitate / are rehabilitating

The verb form stays rehabilitas every time.

It can mean either one. Esperanto present tense is broader than English.

So:

• La terapiisto rehabilitas la pacienton can mean
  The therapist rehabilitates the patient
  or
  The therapist is rehabilitating the patient

Usually the context tells you which is meant.

No, Esperanto word order is fairly flexible because the -n ending shows the direct object.

The most neutral order is:

• La terapiisto rehabilitas la pacienton.

But you could also say:

• La pacienton rehabilitas la terapiisto.

That still means The therapist rehabilitates the patient, because la pacienton has the object marker -n.

Even so, learners should usually start with the normal subject–verb–object order, because it is the clearest and most natural in many situations.

Yes, paciento means a patient in the medical sense.

It is a noun, and the basic noun ending in Esperanto is -o:

• paciento = patient
• terapiisto = therapist

English speakers should be careful not to confuse this with the English adjective patient meaning calm or able to wait. In Esperanto, that idea is usually expressed with pacienca.

So:

• paciento = medical patient
• pacienca = patient, tolerant

No. Esperanto nouns like terapiisto are normally gender-neutral unless something specifically marks gender.

So la terapiisto can mean:

• the therapist, male
• the therapist, female
• the therapist, of unspecified gender

If you need to show gender, Esperanto has ways to do that, but the basic noun by itself does not force one.

A simple pronunciation guide is:

La terapiisto rehabilitas la pacienton
= lah teh-rah-pee-EE-stoh reh-hah-bee-LEE-tahs lah pah-tsee-EN-tohn

A few helpful pronunciation points:

• c is pronounced like ts
• j would sound like English y, though it does not appear here
• stress is always on the second-to-last syllable

So the stressed syllables are:

• terapiisto
• rehabilitas
• pacienton

Yes, depending on the meaning you want.

With la, you are talking about a specific therapist and a specific patient:

• La terapiisto rehabilitas la pacienton.
  = The therapist rehabilitates the patient.

Without la, the sentence is more general or indefinite:

• Terapiisto rehabilitas pacienton.
  = A therapist rehabilitates a patient.

You could also mix them if the context requires it:

• La terapiisto rehabilitas pacienton.
  = The therapist rehabilitates a patient.

Because -o is the basic noun ending in Esperanto.

You can see the structure like this:

• terapi-ist-o = therapy + professional/person + noun ending
• pacient-o-n = patient + noun ending + object marker

This is one of the most important patterns in Esperanto:

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

So the endings help you immediately recognize each word’s grammatical role.