La dentisto preparas injekton.

The -n marks the direct object in Esperanto.

In La dentisto preparas injekton, the dentist is the one doing the action, and injekton is the thing being prepared. So it gets the accusative ending -n.

• la dentisto = the dentist
• preparas = prepares
• injekton = an injection / the injection, as the object of the verb

Without the -n, injekto would just be the basic dictionary form of the noun.

Esperanto has a definite article, la, but it does not have an indefinite article like English a/an.

So:

• la dentisto = the dentist
• injekton = an injection or just injection depending on context

If you wanted to say the injection, you could say la injekton.

So the lack of a word before injekton does not mean anything is missing. That is normal Esperanto.

The ending -as shows the present tense.

So preparas means prepares or is preparing, depending on context.

Esperanto verb endings are very regular:

• -as = present
• -is = past
• -os = future
• -us = conditional
• -u = command / wish
• -i = infinitive

Examples:

• preparas = prepares / is preparing
• preparis = prepared
• preparos = will prepare

In Esperanto, verbs do not change according to the subject.

That means the same form is used for:

• mi preparas = I prepare
• vi preparas = you prepare
• li preparas = he prepares
• ŝi preparas = she prepares
• ili preparas = they prepare

So preparas stays the same no matter who is doing the action. This is much simpler than English.

Yes. Dentisto is built in a very regular Esperanto way.

• dent- = tooth
• -ist- = a person զբաղված in a profession, activity, or system
• -o = noun ending

So dentisto literally means something like tooth-professional, which gives dentist.

The suffix -ist- is very common:

• pianisto = pianist
• arto = art → artisto = artist
• scienco = science → sciencisto = scientist

So learning suffixes helps a lot in Esperanto.

Yes, to some extent.

The most neutral order here is:

• La dentisto preparas injekton.

But because injekton has the object marker -n, Esperanto can also allow other orders, such as:

• Injekton preparas la dentisto.

That still means The dentist prepares an injection, because the -n shows that injekton is the object.

Even so, beginners should usually stick to normal subject–verb–object order unless there is a special reason to change it.

It can mean either one, depending on context.

Esperanto present tense -as covers both:

• simple present: prepares
• present progressive: is preparing

So La dentisto preparas injekton could mean:

• The dentist prepares an injection
• The dentist is preparing an injection

Usually the situation tells you which sounds more natural in English.

A simple pronunciation guide is:

• La → lah
• dentisto → den-TIS-to
• preparas → pre-PA-ras
• injekton → in-YEK-ton

A few useful points:

• Stress is usually on the second-to-last syllable in Esperanto.
• j is pronounced like English y.
• Each vowel is pronounced clearly.

So injekton is not like English in-JEK-shun. It is closer to in-YEK-ton.

Because injekto is the basic noun form, and injekton is that same noun with the direct-object ending -n added.

Breakdown:

• injekt- = injection
• -o = noun
• -n = direct object

So:

• injekto = injection
• injekton = injection, as the object of the sentence

This is very common in Esperanto. For example:

• Mi vidas katon. = I see a cat.
• kato = cat
• katon = cat as direct object

Because Esperanto does not use helper words like English do/does to form ordinary present-tense statements.

English:

• The dentist prepares an injection.

Esperanto simply uses the verb form:

• La dentisto preparas injekton.

No extra word is needed.

This is another way Esperanto is more compact and regular than English.

Yes. Dentisto by itself is normally not specifically male.

So la dentisto can mean:

• the dentist, if the person’s sex is unknown
• the male dentist
• the female dentist

If you really want to make the person explicitly female, traditional Esperanto often uses:

• dentistino = female dentist

But in many contexts, plain dentisto is enough and is not necessarily male.