Mubtada and Khabar — Subject and Predicate
The two pillars of the nominal sentence: what each must be, what each can be, and when their order reverses.
The Two Pillars
Every nominal sentence (jumlah ismiyyah) stands on two parts. The mubtada (مُبْتَدَأ) — literally "the starting point" — is what the sentence is about. The khabar (خَبَر) — literally "the news" — is what is being said about it. زَيْدٌ عَالِمٌ: Zayd (mubtada) is a scholar (khabar). No word for "is" exists or is needed — the structure itself asserts it.
Default rules: the MUBTADA is definite and in raf'. The KHABAR is (normally) indefinite and in raf', matching the mubtada in gender and number where possible.
That pairing — definite then indefinite, both raf' — is precisely what distinguishes a sentence from a descriptive phrase, where all four properties match.
What Can Serve as Khabar?
The khabar is flexible — four main forms fill the slot:
| Khabar type | Example | Meaning |
|---|---|---|
| Single ism | اَللهُ أَكْبَرُ | Allah is the Greatest |
| Phrase (e.g. idafah) | مُحَمَّدٌ رَسُولُ اللَّهِ | Muhammad is the Messenger of Allah |
| Jar-majroor / adverb | اَلْحَمْدُ لِلَّهِ | All praise is for Allah |
| A whole sentence | الْمُعَلِّمُونَ دَخَلُوا الْمَدْرَسَةَ | The teachers entered the school |
When the khabar is itself a verbal sentence, the verb inside it must match the mubtada in both gender and number — الْمُعَلِّمُونَ دَخَلُوا, with the full plural verb. This is the key contrast with the verbal sentence proper, where the verb stays singular.
When the Order Reverses
The mubtada normally comes first — but when the mubtada is indefinite and the khabar is a jar-majroor or adverbial, the khabar must come forward (khabar muqaddam):
Indefinite mubtada + jar-majroor/adverb khabar → the khabar comes FIRST. لَا خَوْفٌ عَلَيْهِمْ — "no fear is upon them": عَلَيْهِمْ (khabar) precedes خَوْفٌ (mubtada).
A jar-majroor can never itself be a mubtada — it can only ever be the news, not the topic.
How Inna and Kana Transform the Pair
Two families of words enter the nominal sentence and each changes one case ending. إِنَّ and her sisters convert the mubtada to nasab (it becomes ismu inna) and leave the khabar raf'. كَانَ and her sisters (including لَيْسَ) leave the subject raf' and convert the khabar to nasab (khabaru kana). Reading which word carries the fatha tells you instantly which family is at work — and a vast number of Quranic case endings are explained by exactly this.
Quranic Example
Frequently Asked Questions
How can a sentence exist with no verb at all?
Arabic asserts "X is Y" by structure alone: a definite topic followed by an indefinite description, both in raf'. The juxtaposition is the assertion. English must insert "is"; Arabic leaves it understood — which is why translations of nominal sentences always add a word that is not in the original.
Why must the mubtada normally be definite?
Communication starts from the known. You announce news about something your listener can identify — "the man is at the door", not "a man is at the door" as a topic. When Arabic does need an indefinite starting point, it flips the order and leads with the khabar instead.
What is the difference between the mubtada and the fa'il?
Both are raf', but they live in different sentence types: the mubtada opens a nominal sentence and is what the sentence is about; the fa'il follows a verb in a verbal sentence and is who did the action. The raf' case marks both roles — context tells you which one you are reading.