الفضاء كبير.

In Arabic, the present tense of to be is usually not expressed in simple sentences like this.

So الفضاء كبير literally looks like space big, but it means Space is big.

This is very normal in Arabic. If you wanted a past or future meaning, then Arabic would use a verb, for example:

• كان الفضاء كبيرًا = Space was big
• سيكون الفضاء كبيرًا = Space will be big

This is a nominal sentence in Arabic, called جملة اسمية.

It has two main parts:

• الفضاء = the subject/topic
• كبير = the predicate/comment

In traditional grammar, these are called:

• المبتدأ = the thing being talked about
• الخبر = what is being said about it

So the structure is:

• الفضاء = the space / space
• كبير = big

Together: Space is big.

Because الفضاء is the subject, and it is definite: the space or space as a known/general concept.

But كبير here is not an adjective directly modifying a noun inside a noun phrase. It is the predicate of the sentence.

Compare these:

• الفضاء كبير = Space is big
• الفضاء الكبير = the big space

In الفضاء الكبير, الكبير is a true adjective modifying الفضاء, so it must match it in definiteness and take الـ.

In الفضاء كبير, كبير is the predicate, so it is normally indefinite.

Yes, but it is functioning as a predicate adjective.

In English, big in Space is big is also an adjective, but it comes after is. In Arabic, since there is usually no present-tense is, the adjective simply appears after the noun:

• الفضاء كبير

So كبير is still an adjective in meaning, but grammatically it is the predicate of the sentence.

With full case endings, it is:

الفضاءُ كبيرٌ

A careful transliteration would be:

al-faḍāʾu kabīrun

Breakdown:

• الفضاءُ = al-faḍāʾu
• كبيرٌ = kabīrun

In normal everyday reading, especially outside fully vocalized texts, these endings are often not written and may not be pronounced clearly.

They show grammatical case in full Arabic.

• الفضاءُ ends in ـُ because it is the subject of the nominal sentence
• كبيرٌ ends in ـٌ because it is the predicate and is indefinite

So in full form:

• الفضاءُ = nominative definite
• كبيرٌ = nominative indefinite

The double ending on كبيرٌ is called tanwīn. It often marks indefiniteness.

The final part of الفضاء is اء, and the last sound includes a hamza: ء.

So the word is not just ending in a long ā sound. It ends with a glottal stop after that long vowel: fa-ḍāʾ.

A rough pronunciation is:

• al-fa-DAAʾ

The final hamza can be tricky for English speakers because English does not always clearly pronounce this kind of stop.

In this sentence, كبير comes after الفضاء because Arabic is stating something about the noun: Space is big.

This is normal word order for a nominal sentence:

• subject
  • predicate

So:

• الفضاء = subject
• كبير = predicate

This is different from an adjective directly modifying a noun inside a noun phrase. For example:

• فضاء كبير = a big space
• الفضاء الكبير = the big space

Those are noun + adjective phrases, not complete sentences.

Yes, depending on context.

الفضاء literally has الـ, so it can be understood as the space. But in many contexts, Arabic uses the definite form for broad or general concepts too, so it can also be translated naturally as space.

So possible translations include:

• Space is big
• The space is big

The context tells you which sounds more natural.

Yes, but الفضاء كبير is the most straightforward and neutral order.

If you change the order, the meaning or emphasis may shift. For a beginner, it is best to learn:

• الفضاء كبير = the normal way to say Space is big

Arabic does allow different word orders in some contexts, but this basic subject-then-predicate pattern is the standard one to start with.

A common way to negate this kind of nominal sentence in Modern Standard Arabic is with ليس:

• الفضاء ليس كبيرًا = Space is not big

Notice that كبير changes to كبيرًا after ليس in full formal grammar.

For a beginner, the main thing to remember is:

• الفضاء كبير = Space is big
• الفضاء ليس كبيرًا = Space is not big