In short

Arabic builds a complete statement out of two nouns and nothing in between. “The house is big” is البَيْتُ كَبيرٌ - word for word “the-house big”. Arabic has no present-tense copula - no word for “is” standing between the halves - so there is nothing to leave out and nothing to conjugate. A sentence that opens with a noun like this is a جُمْلَةٌ اسْمِيَّةٌ, a nominal sentence, and it is the first full sentence type you can produce: give it a definite first half and an indefinite second half and you are already saying something.

The engine of the whole thing is definiteness, not word order. البَيْتُ كَبيرٌ is a sentence, but البَيْتُ الكَبيرُ - the same two words, with الـ added to the second one - is not a sentence at all; it is the phrase “the big house”. One little الـ is the difference between making a claim and merely naming a thing, and it has no equivalent in English. Get that contrast into your ear now, because every A1 sentence you write for the next twenty lessons rests on it.

The rule

Two slots, no verb. The first half is the المُبْتَدَأ, literally “the thing started with” - the subject you are talking about. The second half is the الخَبَر, “the report” - what you say about it. Between them there is silence: no copula, no linking word, no particle. English needs “is”; Arabic needs a pause.

Both halves are in the رَفْع case. The مُبْتَدَأ and the خَبَر both take the ضَمَّة ـُ as their ending. On a definite noun that is a bare ـُ: البَيْتُ. On an indefinite noun it is doubled into tanwīn ـٌ: كَبيرٌ. So the visible difference between البَيْتُ and كَبيرٌ is not a difference of case - both are مَرْفوع - it is the difference between definite and indefinite. Do not read the tanwīn as “a second case”.

These endings are audible only in careful, formal reading; in ordinary speech the final vowel of the last word is dropped at a pause, and in ordinary writing the marks are not printed at all. The pronunciation guide’s lesson on reading unvocalized text deals with both facts. This path prints every ending anyway, because the ending is the grammar being taught, and you cannot learn what you cannot see.

The definiteness asymmetry is the sentence. This is the rule to memorise:

• definite + indefinite = a sentence. البَيْتُ كَبيرٌ. “The house is big.”
• definite + definite = normally a phrase. البَيْتُ الكَبيرُ. “the big house.”

In the second one the adjective has copied the الـ of its noun, and copying definiteness is exactly what a describing adjective does (that is lesson 8). A خَبَر does not copy; it stays نَكِرَة, indefinite, and that is how the reader knows a claim is being made. Whenever a sentence of yours feels like it never lands, check the second word: an الـ you did not mean to write has turned your sentence into a label.

The خَبَر may be a noun or an adjective. Both behave identically - indefinite, مَرْفوع, tanwīn: سَميرٌ مُهَنْدِسٌ “Samir is an engineer” (noun) and البابُ مَفْتوحٌ “the door is open” (adjective). Arabic does not sort these into two constructions the way English sorts “is a teacher” from “is tired”.

Where the tanwīn is written. On a masculine خَبَر the two ḍammas sit on the last consonant: كَبيرٌ، جَديدٌ، مُهَنْدِسٌ. On a feminine خَبَر ending in ة they sit on the ة itself, after the fatḥa of the syllable before it: جَميلَةٌ، نَظيفَةٌ، مُتْعَبَةٌ. The ة is a real letter and takes the ending like any other; it is never dropped and never replaced by ه when you are writing vocalized Arabic.

The مُبْتَدَأ is normally definite, and at this stage you have three ways to be definite. It can carry الـ (البِنْتُ), it can be a proper name (سَميرٌ، مُحَمَّدٌ), or it can be a pronoun (أَنا، هُوَ). Note that many proper names keep a tanwīn - مُحَمَّدٌ، سَميرٌ - and are still definite: tanwīn marks indefiniteness on ordinary nouns, but a name is definite by nature. (A whole class of names - أَحْمَدُ، فاطِمَةُ - takes no tanwīn at all; that is lesson 41.) An indefinite first word on its own gives you no sentence: بَيْتٌ كَبيرٌ is just “a big house”.

A pronoun as مُبْتَدَأ carries no case ending. أَنا مُدَرِّسٌ، هُوَ مَشْغولٌ، هِيَ مُتْعَبَةٌ. The personal pronouns are مَبْنِيّ - “built”, frozen - so they never take ـُ or any other case vowel; the final vowel you see in هُوَ or أَنْتَ is part of the word itself, not an ending. Only the خَبَر after them shows its tanwīn. Lesson 6 gives the full set.

The خَبَر agrees in gender. A feminine مُبْتَدَأ takes a feminine خَبَر, normally with the ending ة: البِنْتُ جَميلَةٌ، الحَقيبَةُ ثَقيلَةٌ، القَهْوَةُ ساخِنَةٌ. Agreement in number waits for the plural lessons (9-12); apart from the plural pronouns, keep both halves singular for now.

ضَميرُ الفَصْل: when the خَبَر has to be definite. Sometimes what you want to say really does need a definite second half - “Muhammad is the manager”, not “a manager”. Written bare, مُحَمَّدٌ المُديرُ is ambiguous: it reads just as easily as the phrase “Muhammad the manager”, a name plus a title. Arabic clears this up with a pronoun slipped in between the two halves, ضَميرُ الفَصْل, “the pronoun of separation”:

مُحَمَّدٌ هُوَ المُديرُ. اللُّغَةُ العَرَبِيَّةُ هِيَ الأَجْمَلُ.

The separating pronoun agrees with the مُبْتَدَأ in gender: هُوَ for a masculine subject, هِيَ for a feminine one. It is not the subject, it is not the predicate, and - this is the trap - it is not a translation of “is”. You reach for it when the خَبَر is definite. With a normal indefinite خَبَر there is nothing to disambiguate and no ضَميرُ الفَصْل is used: البَيْتُ هُوَ كَبيرٌ is not how the thought is expressed.

Not in this lesson. Saying a nominal sentence is not so needs لَيْسَ (lesson 23); putting it in the past needs كانَ (lesson 32); “I have” and “there is” need a predicate moved to the front (lesson 17). Resist the urge to reach for them - everything on this page works without a single verb.

Forms & patterns

The two slots, with both endings marked

Note الطّالِبُ and الدَّرْسُ: ط and د are sun letters, so the ل of the article is not pronounced and the letter after it doubles. That is lesson 4; here just copy the shadda.

Sentence or phrase? One الـ decides

Gender agreement between the halves

A pronoun in the first slot - the pronoun never changes, only the خَبَر does

With أَنا the خَبَر follows the speaker’s own gender, so a woman says أَنا مُدَرِّسَةٌ. The full pronoun set, including the dual and the plurals, is lesson 6.

ضَميرُ الفَصْل - the separating pronoun

Only the singular هُوَ / هِيَ is tabled here. The dual and plural separating pronouns (هُما، هُمْ، هُنَّ) work the same way, but they wait for lessons 9-16, where their nouns are taught.

Examples

Common mistakes

• البَيْتُ يَكونُ كَبيرًا. -> البَيْتُ كَبيرٌ. - Arabic has no present-tense copula. يَكونُ exists, but it says “it comes to be / it is habitually so”, not the plain “is” of this sentence, and inserting it here is the single most recognisable beginner’s sentence.
• البَيْتُ الكَبيرُ. (meaning “the house is big”) -> البَيْتُ كَبيرٌ. - With الـ on the second word you have written the phrase “the big house”. The خَبَر must stay indefinite for the sentence to say anything.
• البَيْتُ هُوَ كَبيرٌ. -> البَيْتُ كَبيرٌ. - هُوَ is not “is”. The separating pronoun belongs with a definite خَبَر, which كَبيرٌ is not.
• مُحَمَّدٌ المُديرُ. (meaning “Muhammad is the manager”) -> مُحَمَّدٌ هُوَ المُديرُ. - Without هُوَ the words are ambiguous, and the reader is likely to take المُديرُ as a title attached to the name, “Muhammad the manager”. The pronoun is what forces the reading you want.
• البِنْتُ جَميلٌ. -> البِنْتُ جَميلَةٌ. - The خَبَر agrees with the مُبْتَدَأ in gender; a feminine subject needs the ة on the predicate.
• بَيْتٌ كَبيرٌ. (meaning “the house is big”) -> البَيْتُ كَبيرٌ. - Two indefinite words in a row are a noun phrase, “a big house”. In a plain two-word sentence the مُبْتَدَأ has to be definite.
• الطّالِبُ جَديدًا. -> الطّالِبُ جَديدٌ. - Both halves are مَرْفوع. The accusative ـً belongs to the خَبَر of كانَ, which is lesson 32, not here.
• الجَوُّ جَميلُ. -> الجَوُّ جَميلٌ. - For an ordinary noun like جَميل, indefinite and مَرْفوع means the doubled ـٌ, never the bare ـُ. (One class of nouns does take a bare ـُ while indefinite; that is lesson 41.)
• اللُّغَةُ العَرَبِيَّةُ هُوَ الأَجْمَلُ. -> اللُّغَةُ العَرَبِيَّةُ هِيَ الأَجْمَلُ. - The separating pronoun matches the gender of the subject, not of the predicate.
• أَنا مُدَرِّسًا. -> أَنا مُدَرِّسٌ. - أَنا itself is frozen and takes no ending, but the خَبَر after it is a normal indefinite مَرْفوع noun.

Tips

• Read the sentence as an equation: X = Y. The equals sign is not written, it is silence, and English “is” is what you supply when translating out - never when translating in.
• Listen for the tanwīn. In careful reading, ـٌ at the end of the second word is the audible signal “this is a statement”. الـ at the start of it is the signal “this is only a label”.
• Cover the second word of anything you write and ask: did I mean to describe, or to claim? Describe takes الـ, claim takes tanwīn. This single test prevents most A1 errors.
• Build a small stock of paired adjectives you can drop straight into the خَبَر slot: كَبيرٌ / صَغيرٌ، جَديدٌ / قَديمٌ، سَهْلٌ / صَعْبٌ، مَفْتوحٌ / مُغْلَقٌ. Learn each with its feminine in ة from the first day.
• Remember that a name is already definite even though it wears a tanwīn: مُحَمَّدٌ طالِبٌ is a perfectly formed sentence.
• Use ضَميرُ الفَصْل as a fixed pair with a definite predicate: the moment you mean a definite second half, reach for هُوَ or هِيَ. Arabic can manage without it, but with it your sentence can no longer be misread as a phrase.
• Ignore the pronunciation of the endings for now if it slows you down. Read them aloud when you are drilling grammar, drop them at a pause when you are talking - the pronunciation guide’s lesson on the pausal form formalises this.
• Do not try to negate or move these sentences into the past yet. Everything you need for that arrives in lessons 23 and 32; using this pattern in the present is a complete skill on its own.