Medicul tânăr este aici.

-ul is the definite article attached to the end of the noun in Romanian.

• medic = doctor / a doctor
• medicul = the doctor

Unlike English, Romanian usually puts the at the end of the noun instead of before it.

In Romanian, adjectives often come after the noun.

So:

• medicul tânăr = the young doctor

This is the normal order in many cases. English usually says young doctor, but Romanian commonly says doctor young literally.

Because the definiteness is already shown on the noun medicul.

In Romanian, when a noun + adjective phrase is definite, the definite article is often attached to the noun, while the adjective stays in its basic form:

• medic tânăr = a young doctor
• medicul tânăr = the young doctor

So tânăr does not need its own definite ending here.

Este means is. It is the 3rd person singular form of the verb a fi = to be.

So:

• este aici = is here

In this sentence, it links the subject medicul tânăr with the location aici.

In standard Romanian, este is normally included in a sentence like this.

So the normal full sentence is:

• Medicul tânăr este aici.

In casual speech, people may sometimes omit words in certain contexts, but for a learner, you should treat este as necessary here.

Romanian works differently from English.

1. The is already built into medicul.
2. tânăr is just the adjective young.
3. aici means here by itself and does not need an article.

So Romanian does not copy the English word-by-word structure.

Not always, but it is very natural here.

• Medicul tânăr este aici. = neutral, standard
• Aici este medicul tânăr. = puts more focus on here
• Este aici medicul tânăr. = possible in some contexts, but less neutral

Romanian word order is somewhat flexible, but the given sentence is the most straightforward version.

A rough guide is TUH-nuhr, but the special vowel â does not exist in English, so no English spelling is perfect.

A few notes:

• â is a central vowel, pronounced deep in the middle of the mouth
• the final r is pronounced clearly
• both vowels in tânăr are short

So it is better to listen to native audio if possible, because â is one of the trickier Romanian sounds for English speakers.

They are location words:

• aici = here
• acolo = there

So:

• Medicul tânăr este aici. = The young doctor is here.
• Medicul tânăr este acolo. = The young doctor is there.

No, not in this form.

medicul tânăr is understood as one noun phrase: the young doctor.

If you wanted to say The doctor is young and here, Romanian would normally use something like:

• Medicul este tânăr și aici.

So in your sentence, tânăr describes medicul, not the state after is.

That changes the meaning from definite to indefinite.

• Medicul tânăr este aici. = The young doctor is here.
• Un medic tânăr este aici. = A young doctor is here.

So:

• medicul = the doctor
• un medic = a doctor

Yes, in this sentence medicul is masculine singular, and tânăr agrees with it.

Romanian adjectives agree with the noun in gender and number.

For example:

• masculine singular: medicul tânăr
• feminine singular: doctorița tânără or medica tânără depending on word choice
• plural masculine: medicii tineri
• plural feminine: doctorițele tinere

So the form tânăr matches a masculine singular noun.