Ea sună la hotel ca să verifice rezervarea pentru weekend.

Yes. Romanian often drops subject pronouns when the verb already shows the person clearly.

• sună already means he/she calls / is calling
• so Sună la hotel... is a complete sentence

Adding Ea does one of these things:

• makes the subject clearer from context
• adds emphasis: She is the one calling
• contrasts with someone else

So both are possible, but Ea is a bit more explicit.

The verb a suna can mean more than one thing, just like to ring / to sound / to call in English.

In this sentence, Ea sună la hotel means:

• She calls the hotel
• or She is calling the hotel

This is because the structure a suna la + place/person usually means to phone / call.

Examples:

• Sun la doctor. = I’m calling the doctor.
• Telefonul sună. = The phone is ringing.
• Asta sună bine. = That sounds good.

So the meaning depends on context and structure.

Because Romanian uses the preposition la after a suna when you mean to call someone/somewhere.

So:

• a suna la hotel = to call the hotel
• literally, this is closer to to ring at / to call to the hotel

This is just the normal pattern of the verb in Romanian.

Compare:

• Sun la recepție. = I’m calling reception.
• Sun la Maria. = I’m calling Maria.

English says call the hotel, but Romanian normally says a suna la hotel.

ca să introduces a purpose, so it means:

• so that
• in order to
• so as to

In this sentence:

• Ea sună la hotel ca să verifice rezervarea
  = She calls the hotel in order to check the reservation

This is a very common Romanian structure for expressing purpose.

You will often see:

• Vin ca să te ajut. = I’m coming to help you.
• Studiază ca să învețe. = He/She studies in order to learn.

Because after ca să, Romanian normally uses the subjunctive.

So:

• a verifica = the infinitive, to check
• verifică = indicative present, he/she checks
• să verifice = subjunctive present, that he/she check / to check

After ca să, the correct structure is:

• ca să verifice = in order to check

So the sentence needs the subjunctive form, not the plain present indicative.

In Romanian, the subjunctive is usually signaled by să.

Here the pattern is:

• ca să + verb

So:

• ca să verifice

That tells you the verb is in the subjunctive.

For many verbs, the subjunctive form may look different from the normal present tense. Here:

• el/ea verifică = he/she checks
• el/ea să verifice = that he/she check / to check

That difference is completely normal in Romanian.

rezervarea means the reservation / the booking.

Romanian usually puts the definite article at the end of the noun:

• rezervare = a reservation
• rezervarea = the reservation

So the ending -a is the definite article here.

This sentence refers to a specific reservation, so rezervarea is the natural choice.

Compare:

• Are o rezervare. = She has a reservation.
• Verifică rezervarea. = She checks the reservation.

Romanian handles definiteness differently from English.

1. For many nouns, the is attached to the end of the noun:

   • hotel = hotel
   • hotelul = the hotel

2. But after some prepositions, or when speaking more generally, Romanian may use the bare noun:

   • la hotel = at/to the hotel or to the hotel
   • pentru weekend = for the weekend

So Romanian does not always match English word-for-word with articles.

If you wanted to make the hotel more explicit in some contexts, you could say la hotelul..., especially when it is followed by more information:

• la hotelul unde stau = to the hotel where they are staying

But la hotel is perfectly natural here.

Here pentru weekend means for the weekend, modifying rezervarea:

• rezervarea pentru weekend = the reservation for the weekend

It describes what the reservation is for.

That is different from în weekend, which usually means during the weekend / on the weekend.

Compare:

• rezervare pentru weekend = reservation for the weekend
• în weekend merge acolo = he/she goes there on the weekend

So pentru is used because it belongs with rezervarea, not because it describes when she calls.

Yes. sună is present tense, third person singular.

Romanian present tense often covers both:

• she calls
• she is calling

The exact English translation depends on context.

So:

• Ea sună la hotel can mean either
  • She calls the hotel
  • She is calling the hotel

Romanian does not have a separate continuous form like English is calling, so the simple present often does both jobs.

The letter ă is a very common Romanian vowel. It is a short, neutral sound, similar to the a in English sofa for many speakers.

So:

• sună is roughly SOO-nuh
• să is roughly suh

A few quick notes:

• u in sună sounds like oo
• ă is not a full a like in father
• it is shorter and more central

If you can produce a relaxed uh sound, you will be close.