قاعة الزفاف كبيرة.

In Arabic, the verb to be is usually not written or said in the present tense.

So:

• قاعة الزفاف كبيرة = The wedding hall is big

There is no separate word for is here. Arabic simply puts the subject and the description next to each other.

This is very normal in Arabic:

• البيت كبير = The house is big
• المدينة جميلة = The city is beautiful

If you want was or will be, then Arabic does use verbs such as كان.

قاعة الزفاف literally means hall of the wedding.

This is a very common Arabic structure called الإضافة (the iḍāfa construction), which is often used to show possession or a close relationship between two nouns.

Here:

• قاعة = hall
• الزفاف = the wedding

Together:

• قاعة الزفاف = the wedding hall

In English, we often use of or a noun-noun combination. Arabic often uses iḍāfa instead.

More examples:

• باب البيت = the door of the house
• كتاب الطالب = the student’s book
• مدير المدرسة = the school principal

This is a key feature of iḍāfa.

In an iḍāfa phrase:

• the first noun usually does not take الـ
• the second noun can make the whole phrase definite

So in:

• قاعة الزفاف

the second noun الزفاف is definite because it has الـ. That makes the whole phrase definite:

• قاعة الزفاف = the wedding hall

If the second noun were indefinite, the whole phrase would be indefinite:

• قاعة زفاف = a wedding hall

So even without الـ on قاعة, the whole phrase can still mean the wedding hall.

Because it describes قاعة, and قاعة is a feminine noun.

In Arabic, adjectives agree with the noun they describe in things like:

• gender
• number
• definiteness

So:

• قاعة is feminine singular
• therefore the adjective must also be feminine singular
• كبير becomes كبيرة

Compare:

• قاعة كبيرة = a big hall
• بيت كبير = a big house

The feminine ending here is ـة on كبيرة.

Because in this sentence, كبيرة is functioning as the predicate of the sentence, not as an attributive adjective inside the noun phrase.

Compare these two patterns:

1. Predicate adjective

   • قاعة الزفاف كبيرة
   • The wedding hall is big

2. Attributive adjective

   • قاعة الزفاف الكبيرة
   • the big wedding hall

In Arabic, if the adjective is directly part of the noun phrase, it matches definiteness:

• البيت الكبير = the big house

But if it is the predicate in a sentence meaning is big, it is usually indefinite:

• البيت كبير = the house is big

So كبيرة is correct here because the sentence means The wedding hall is big, not the big wedding hall.

In Arabic, adjectives normally come after the noun they describe.

So:

• قاعة كبيرة = a big hall
• مدينة جميلة = a beautiful city
• بيت واسع = a spacious house

This is different from English, where adjectives usually come before the noun:

• big hall
• beautiful city
• spacious house

In your sentence, كبيرة comes after قاعة الزفاف for that reason.

It is a nominal sentence.

Arabic sentences are often divided into:

• verbal sentences: start with a verb
• nominal sentences: start with a noun

Here, the sentence starts with قاعة الزفاف, which is a noun phrase, so it is a nominal sentence.

Its basic structure is:

• قاعة الزفاف = the subject/topic
• كبيرة = the predicate/comment

So the sentence means:

• The wedding hall is big

A careful pronunciation would be approximately:

• qāʿat az-zifāf kabīrah

A few notes:

• ق is a deep q sound, not exactly like English k
• ع is a consonant with no exact English equivalent
• الزفاف is pronounced with assimilation of ل because ز is a sun letter
  • so الزفاف sounds like az-zifāf, not al-zifāf

Word by word:

• قاعة → qāʿah or qāʿatu in full case-ending pronunciation
• الزفاف → az-zifāf
• كبيرة → kabīrah

In normal pause pronunciation, the final short vowels are usually not pronounced.

The ل of الـ is not clearly pronounced before certain letters called sun letters.

Since ز is a sun letter, الزفاف is pronounced:

• az-zifāf

not:

• al-zifāf

In writing, nothing changes:

• الزفاف

But in pronunciation, the z sound is doubled, and the l is absorbed.

This also happens in words like:

• الشمس → ash-shams
• السماء → as-samāʾ
• الزمن → az-zaman

In full formal Arabic with case endings, the sentence would be:

• قاعةُ الزفافِ كبيرةٌ

Here is why:

• قاعةُ: nominative, because it is the subject of the nominal sentence
• الزفافِ: genitive, because it is the second noun in an iḍāfa
• كبيرةٌ: nominative, because it is the predicate

However, in most everyday pronunciation and in much modern spoken/formal usage outside careful recitation, these endings are often not pronounced. So learners commonly see and hear:

• قاعة الزفاف كبيرة

That is completely normal.

Yes, but the meaning changes.

• القاعة كبيرة = The hall is big
• قاعة الزفاف كبيرة = The wedding hall is big

The first sentence talks about the hall in a general or previously known sense.

The second sentence specifies which hall:

• the hall associated with the wedding

So قاعة الزفاف is more specific than just القاعة.

These are different structures:

1. A wedding hall is big

   • قاعة زفاف كبيرة
   • This can also sound like a big wedding hall, depending on context, because Arabic without a clear sentence context can be less explicit here.

2. The wedding hall is big

   • قاعة الزفاف كبيرة

3. The big wedding hall

   • قاعة الزفاف الكبيرة

4. The wedding hall is the big one

   • قاعة الزفاف هي الكبيرة
     or in some contexts
   • قاعة الزفاف الكبيرة if it is just a noun phrase, not a full sentence

So the presence or absence of الـ on the adjective makes an important difference.

Yes, but the basic sentence you have is the most straightforward.

Normal order:

• قاعة الزفاف كبيرة

This is the clearest neutral way to say:

• The wedding hall is big

In some contexts, Arabic can change word order for emphasis, but for a learner, the standard pattern is best:

• subject first
• predicate second

So this sentence is an excellent model to follow.