غرفة تبديل الملابس كبيرة ونظيفة.

Arabic often builds this kind of idea with an iḍāfa (construct phrase), where the main noun comes first and is followed by what specifies it.

So this phrase is literally something like:

• غرفة = room
• تبديل = changing
• الملابس = the clothes

Put together, it means the room of changing clothes, which is the natural Arabic way to say changing room.

English often puts the describing word first (changing room), but Arabic usually starts with the main thing (room) and then adds the description after it.

تبديل is a verbal noun (called a maṣdar) from the verb بدّل = to change / to replace.

So تبديل means:

• changing
• the act of changing

In this sentence, it acts like a noun inside the phrase غرفة تبديل الملابس.

So the structure is not a verb like a room changes the clothes. Instead, it is a noun phrase meaning a room for changing clothes.

It is definite.

That can be confusing because غرفة does not have الـ on it. But in an iḍāfa, the whole phrase gets its definiteness from the last noun.

Here:

• الملابس = the clothes (definite because of الـ)
• therefore تبديل الملابس is definite
• therefore غرفة تبديل الملابس is also definite

So the whole phrase is understood as the changing room, not a changing room.

In Arabic, the present tense often has no written or spoken word for is / am / are in simple statements.

So:

• غرفة تبديل الملابس كبيرة ونظيفة literally looks like:
• The changing room big and clean

But it means:

• The changing room is big and clean

This is a normal nominal sentence in Arabic.

If you wanted was, then Arabic would use a verb such as كان:

• كانت غرفة تبديل الملابس كبيرة ونظيفة = The changing room was big and clean

Because they describe غرفة, and غرفة is a feminine singular noun.

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

• gender
• number
• definiteness

So:

• غرفة = feminine singular
• كبيرة = big (feminine singular)
• نظيفة = clean (feminine singular)

If the noun were masculine, you would usually get:

• كبير instead of كبيرة
• نظيف instead of نظيفة

A big clue is the ending ة (tāʾ marbūṭa), which very often marks feminine nouns.

So غرفة is feminine, and that is why the adjectives are feminine too.

This pattern is very common:

• غرفة كبيرة
• سيارة سريعة
• مدينة جميلة

However, not every feminine noun ends in ة, and not every noun ending in ة behaves exactly the same in every context, so it is best to learn each noun with its gender.

Because here they are not attributive adjectives inside the noun phrase; they are predicates in a sentence.

Compare these two patterns:

1. Attributive adjective:
   الغرفة الكبيرة = the big room
   Here the adjective matches the noun in definiteness, so both are definite.

2. Predicate adjective:
   الغرفة كبيرة = the room is big
   Here كبيرة is the predicate, so it is usually indefinite.

Your sentence is the second type:

• غرفة تبديل الملابس = the subject
• كبيرة ونظيفة = the predicate

So it means The changing room is big and clean, not the big and clean changing room.

و means and.

So:

• كبيرة = big
• نظيفة = clean
• كبيرة ونظيفة = big and clean

Arabic uses و very frequently to join words, phrases, and sentences.

Because الملابس means clothes, which is normally treated as a plural idea.

The singular ملبس is not the usual everyday word a learner would use for clothing item in this context. In ordinary Arabic, الملابس is the natural word for clothes.

So تبديل الملابس means changing clothes, not changing a garment.

Usually, ة at the end of a word is pronounced like -a or -ah when you pause.

So in pause:

• غرفة ≈ ghurfa
• كبيرة ≈ kabīra
• نظيفة ≈ naẓīfa

But in careful MSA pronunciation, when the word is followed by another word in an iḍāfa, the ة is pronounced as t.

So غرفة تبديل الملابس is more carefully pronounced like:

• ghurfat tabdīl al-malābis

This is why learners sometimes hear both an -a sound and a -t sound from the same spelling.

A fully vowelled MSA version would be:

غُرْفَةُ تَبْدِيلِ الْمَلَابِسِ كَبِيرَةٌ وَنَظِيفَةٌ

This shows the grammar more clearly:

• غرفةُ = nominative, because it is the subject
• تبديلِ = genitive, because it is in an iḍāfa
• الملابسِ = genitive, because it completes the iḍāfa
• كبيرةٌ and نظيفةٌ = nominative predicate adjectives

In normal everyday writing, these short vowels are usually omitted, so learners have to infer them from the grammar.

It is a full sentence.

The first part, غرفة تبديل الملابس, is a noun phrase: the changing room.

Then كبيرة ونظيفة tells you something about it: is big and clean.

So the sentence structure is:

• subject: غرفة تبديل الملابس
• predicate: كبيرة ونظيفة

That makes it a complete statement, not just a label.