أخي في البيت.

أخي means my brother.

It has two parts:

• أخ = brother
• ـي = my

So Arabic attaches the possessive ending directly to the noun, instead of using a separate word like my before it.

Pronunciation: ʾakhī or simply akhi in beginner-friendly transliteration.

In the present tense, Arabic usually does not use a separate word for is / am / are in simple sentences like this.

So:

• أخي في البيت.
• literally: My brother in the house
• natural English: My brother is in the house or My brother is at home

This kind of sentence is very normal in Arabic.

في means in.

It is a preposition, so في البيت means:

• in the house
• or, depending on context, at home

So the sentence is saying where the brother is.

الـ is the Arabic definite article, meaning the.

So:

• بيت = a house / house
• البيت = the house

In this sentence, البيت can also sound natural in English as home, not just the house. Arabic often uses البيت in a way that can match English home.

It can mean both, depending on context.

• Literal meaning: in the house
• Natural English meaning in many situations: at home

So if someone is simply saying where their brother is, My brother is at home is often the best translation.

This is a nominal sentence in Arabic, meaning a sentence that does not need a verb like is in the present tense.

It has two main parts:

• أخي = the topic / subject
• في البيت = the information about it, telling location

So the structure is:

• My brother
  • in the house

In traditional Arabic grammar, في البيت is a prepositional phrase functioning as the predicate.

Because في is a preposition, and the noun that comes after a preposition follows it directly.

So:

• في البيت = in the house

This is similar to English word order in this case, where the preposition comes before the noun.

After a preposition like في, the following noun is grammatically in the genitive case.

So in fully vowelled Arabic, it is:

• في البيتِ

That final ـِ is the genitive ending.

However, in normal reading and speech, short case endings are often:

• not written in ordinary text
• not clearly pronounced at the end of a sentence

So you may hear:

• fī l-bayt

instead of the full grammatical form:

• fī l-bayti

Both relate to the same sentence; the difference is mostly about formality and pronunciation style.

A careful pronunciation is:

• ʾakhī fī al-bayti

In smoother connected speech, it is often closer to:

• ʾakhī fī l-bayt

A simple learner-friendly pronunciation is:

• a-khee fee al-bayt
• or more naturally, a-khee feel-bayt

Notes:

• أخ begins with a hamza, a clear vowel start
• خ is the deep throaty sound, like the ch in German Bach or Scottish loch
• ي at the end of أخي is a long ee sound

It could be, but it would mean something slightly different.

• البيت = the house / home
• منزل = house, home, residence

Both are possible words, but البيت is very common and natural.

Also, if you said في بيت without الـ, it would usually mean in a house, not in the house / at home.

So أخي في البيت is a very natural choice for My brother is at home.

Yes, Arabic word order can sometimes change for emphasis.

The basic neutral sentence is:

• أخي في البيت.

You may also see:

• في البيت أخي.

That can sound more marked or literary, with extra focus on the location.

For a beginner, the original order is the best and most neutral one to learn first.

Yes, it is a complete sentence.

Arabic does not need a present-tense is here, so this short sentence is fully grammatical and complete.

It already tells you:

• who: أخي = my brother
• where: في البيت = in the house / at home

So nothing is missing.

Because ordinary Arabic writing usually leaves out most short-vowel marks.

So learners often see:

• أخي في البيت

instead of the fully vowelled form:

• أخي في البيتِ

This is normal in newspapers, books, signs, and most everyday writing. As you learn more Arabic, you get used to supplying the short vowels from context.