اخي نسي كتابه بالجامعة.

A natural Levantine-style pronunciation would be something like:

akhi nese ktaabo bil-jāmʿa

A few notes:

• أخي / اخي = akhi
• نسي is often pronounced nese or نسي / nisi, depending on the region
• كتابه is often pronounced ktaabo in Levantine
• بالجامعة is often bil-jāmʿa or bel-jāmʿa

So the written sentence looks fairly standard, but the spoken pronunciation shifts toward Levantine patterns.

The -ي at the end is a possessive suffix meaning my.

So:

• أخ = brother
• أخي = my brother

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

Yes. In standard spelling, it is usually written أخي.

The version اخي is very common in casual typing and texting, where people often leave out the hamza. So:

• أخي = more standard spelling
• اخي = common informal spelling

Both are easily understood.

Just like -ي can mean my, the suffix -ه means his.

So:

• كتاب = book
• كتابه = his book

Arabic usually expresses possession with suffixes attached directly to the noun.

In Levantine pronunciation, -ه here is often pronounced more like -o, so كتابه may sound like ktaabo. In very informal dialect writing, people may even write كتابو.

بالجامعة is made of two parts:

• بـ = in / at
• الجامعة = the university

Together:

• بـ + الجامعة = بالجامعة

So the بـ is the preposition, and the الـ is the definite article the.

In Levantine, بـ very often covers meanings like in, at, or with, depending on context.

In Levantine Arabic, بـ is extremely common for location, and it often means in or at.

So بالجامعة is very natural for at the university or in the university.

You may also hear في الجامعة, but بـ is especially common in everyday speech. In many Levantine sentences, بـ sounds more conversational and native-like.

Arabic can do both.

This sentence is:

• أخي نسي كتابه بالجامعة
• literally: My brother forgot his book at the university

This is a subject-first order, which is very common in speech and everyday language.

You could also say:

• نسي أخي كتابه بالجامعة

That is a more verb-first order, which also exists in Arabic.

So both are possible, but subject-first is especially common in spoken Levantine.

نسي is the past tense (also called the perfect) of the verb to forget.

Here it is specifically:

• third person
• masculine
• singular

That matches أخي because my brother is one male person.

Very roughly:

• نسي = he forgot
• نسيت = I forgot / you forgot / she forgot, depending on context
• نسوا = they forgot

So in this sentence, نسي is the correct form for my brother.

It is understandable in Levantine, but it looks a bit more neutral written Arabic or semi-formal than fully everyday dialect.

A more colloquial Levantine version might be something like:

• أخوي نسي كتابو بالجامعة
• or in some areas: خيّي نسي كتابو بالجامعة

Why?

• أخي can sound a bit formal or standard-like in some dialect contexts
• كتابه is often pronounced and informally written as كتابو
• الجامعة is often pronounced jāmʿa, not fully jāmiʿa

So the sentence is fine, but it sits a little closer to standard spelling than to fully casual spoken Levantine writing.

Because this is not fully formal classical-style Arabic with case endings. In spoken Levantine, and in most everyday writing, case endings are not used.

So you get:

• أخي
• نسي
• كتابه
• بالجامعة

without the formal endings you might see in fully vocalized Standard Arabic.

That is normal for dialect and for most ordinary unvocalized Arabic writing.

Because the verb form already contains that information.

نسي already tells you the subject is:

• third person
• masculine
• singular

Then the noun أخي makes it explicit who that person is.

So Arabic does not need a separate word like he here. The sentence already has everything it needs:

• أخي = my brother
• نسي = forgot

Together, that is fully complete.