اختي حجزت غرفة مزدوجة.

The -ي is the attached possessive suffix meaning my.

So:

• أخت / اخت = sister
• أختي / اختي = my sister

Arabic often attaches possessive words directly to the noun instead of using a separate word like my.

حجزت is the past tense of حجز, which means to book or to reserve.

In this sentence, it means she booked / she reserved, because the subject is اختي = my sister.

A useful thing to know: in Arabic writing without vowel marks, حجزت can also represent I booked. Context tells you which meaning is intended. Here, because the sentence starts with my sister, the meaning is clearly my sister booked.

Because Arabic often does not need an explicit subject pronoun if the subject is already clear.

Here, اختي already tells you who did the action, so adding هي would be unnecessary. Arabic commonly works like this:

• اختي حجزت... = My sister booked...

You do not need to say هي unless you want extra emphasis.

Because in Arabic, adjectives normally come after the noun they describe.

So:

• غرفة = room
• مزدوجة = double

Together: غرفة مزدوجة = a double room

This is a very common pattern in Arabic:

• بيت كبير = a big house
• سيارة جديدة = a new car
• غرفة مزدوجة = a double room

Because غرفة is a feminine noun, and the adjective has to agree with it.

So:

• غرفة = feminine noun
• مزدوجة = feminine adjective

The masculine form would be مزدوج.

The final ة is the feminine ending, often called taa marbuuTa. In Levantine pronunciation, it often sounds like -e at the end of a word.

Arabic does not have an indefinite article like a/an in English.

So غرفة مزدوجة can mean a double room without needing any extra word.

If you wanted to say the double room, you would make both words definite:

• الغرفة المزدوجة = the double room

Yes, that is possible.

Arabic can use both:

• اختي حجزت غرفة مزدوجة
• حجزت اختي غرفة مزدوجة

The first one, with the subject first, is very common in everyday Levantine speech. The second one is more verb-first. The meaning is basically the same, but the emphasis or style can feel slightly different.

It is correct and fully understandable, but it can sound a bit more formal or standard.

In everyday Levantine, many speakers might also say things like:

• غرفة دبل
• أوضة دبل (in places where أوضة is used for room)

So the sentence is good Arabic, but in casual spoken Levantine you may also hear more borrowed or colloquial hotel vocabulary.

A rough pronunciation would be something like:

ekhti hajazet ghurfe muzdawje

But pronunciation varies by country and speaker.

A few helpful notes:

• اختي → ekh-ti
• ح in حجزت is a stronger, breathier h than English h
• غ in غرفة is a deep throaty sound, often written gh
• final ة often sounds like -e in Levantine speech

So even if different speakers pronounce some vowels differently, the overall shape will sound close to that.