In short

Lesson 43 gave you a family of words that leave the subject alone and pull the predicate into the accusative: كانَ الطّالِبُ مُجْتَهِدًا. This lesson gives you the family that does the exact opposite. Put إِنَّ in front of the same sentence and the first noun takes the fatḥa while the second keeps its ḍamma: إِنَّ الطّالِبَ مُجْتَهِدٌ. Two families, one mirror. Once you can see which of the two words moved, you can name the word that moved it.

There are six of them - إِنَّ، أَنَّ، كَأَنَّ، لٰكِنَّ، لَيْتَ، لَعَلَّ - covering emphasis, the “that” of reported speech and of opinions, comparison, contrast, wishes and hopes. The case rule is one line wide; the real work is elsewhere. English hands over a single word “that” where Arabic has three - إِنَّ، أَنَّ and the أَنْ of lesson 34 - and picking the right one is the skill this lesson actually buys you.

The rule

1. The frame: إِنَّ + اسْمُها مَنْصوب + خَبَرُها مَرْفوع. Take a nominal sentence and put إِنَّ in front of it. Nothing is deleted or reordered; only the ending of the first word changes.

الطّالِبُ مُجْتَهِدٌ. -> إِنَّ الطّالِبَ مُجْتَهِدٌ. / الجَوُّ بارِدٌ. -> إِنَّ الجَوَّ بارِدٌ.

The two halves take new names, exactly as they did with كانَ: the first noun is اسْمُ إِنَّ, the second خَبَرُ إِنَّ. Arabic grammar calls the six الحُروفُ المُشَبَّهَةُ بِالفِعْل, “the particles that resemble a verb”, because they govern a noun the way a verb governs its object - but they are particles, not verbs: no conjugation, no tense, no person.

What does إِنَّ mean? Usually nothing you can translate. It marks the sentence as asserted with weight - “the student really is hard-working” - and in ordinary prose it is simply how a statement is opened. Do not force an English word into it.

2. The accusative on اسْمُها is a case, not a mark. Every declension class shows it its own way - the same list you drilled for the predicate of كانَ, applied to the other slot.

• definite singular: إِنَّ الطّالِبَ مُجْتَهِدٌ / إِنَّ المُديرَ مَشْغولٌ
• ending in ة: إِنَّ المُدَرِّسَةَ غائِبَةٌ
• sound masculine plural: إِنَّ المُهَنْدِسينَ مَشْغولونَ (not *المُهَنْدِسونَ)
• sound feminine plural: إِنَّ الطّالِباتِ مُجْتَهِداتٌ - a kasra, never a fatḥa
• dual: إِنَّ الوَلَدَيْنِ نائِمانِ
• first term of an إِضافَة: إِنَّ مُديرَ الشَّرِكَةِ مُسافِرٌ

3. خَبَرُها stays مَرْفوع, and it has the same three shapes as any خَبَر. Lesson 17’s classification survives intact: the predicate can be a single word, a whole sentence, or a شِبْه جُمْلَة.

• مُفْرَد: إِنَّ الاِمْتِحانَ صَعْبٌ.
• جُمْلَة: إِنَّ الطُّلّابَ يَسْتَعِدّونَ لِلاِمْتِحانِ.
• شِبْه جُمْلَة: إِنَّ المُديرَ في مَكْتَبِهِ.

The sentence-shaped predicate matters, because it is the only way a verb gets into an إِنَّ sentence: إِنَّ الطَّقْسَ سَيَتَحَسَّنُ غَدًا is fine, *إِنَّ سَيَتَحَسَّنُ is not.

4. اسْمُها is normally definite, and what licenses an indefinite one is a fronted predicate. The old rule that a مُبْتَدَأ is normally definite (lesson 2) carries over, licences and all: a bare indefinite needs something to justify it, and in practice that something is the fronted predicate below. So *إِنَّ رَجُلًا في البَيْتِ is not how you say “there is a man in the house”. Instead you use the fronted شِبْه جُمْلَة of lesson 17, and the delayed اسْم - now indefinite and مَنْصوب - follows it:

إِنَّ في البَيْتِ رَجُلًا. / إِنَّ هُناكَ مُشْكِلَةً كَبيرَةً. / إِنَّ عِنْدَنا وَقْتًا كافِيًا. / إِنَّ لِلطُّلّابِ حُقوقًا وواجِباتٍ.

Compare them without إِنَّ - في البَيْتِ رَجُلٌ، هُناكَ مُشْكِلَةٌ كَبيرَةٌ، عِنْدَنا وَقْتٌ كافٍ - and you see exactly which word إِنَّ reached for. Note what did not change: في البَيْتِ is a preposition with its noun and stays مَجْرور. إِنَّ never touches a شِبْه جُمْلَة.

5. With a pronoun, the pronoun is the اسْم - and it is the attached one. An independent pronoun (هُوَ، أَنا) has no case form at all, so it cannot fill an accusative slot. What goes onto إِنَّ is the attached set of lesson 29, the same one a verb takes for its object. Grammar books call it في مَحَلِّ نَصْب, “in the accusative position”: the slot is accusative even though nothing shows.

إِنَّهُ مُهَنْدِسٌ. / إِنَّها مَشْغولَةٌ. / إِنَّكَ عَلى حَقٍّ. / إِنَّهُمْ في الطَّريقِ.

For “I” the ending is ـني, not ـي: the extra ن (نونُ الوِقايَة, “the protecting nūn”) keeps the particle out of a kasra. إِنَّني and the contracted إِنِّي are both correct and common; لَيْتَ in practice keeps the ن - لَيْتَني - while لَعَلَّ is more often heard contracted, لَعَلِّي. The خَبَر after the pronoun stays مَرْفوع: إِنَّني مُتْعَبٌ.

6. The other five, one line each. أَنَّ gets its own sub-rules below; here are the rest.

• كَأَنَّ - “as if, like”. كَأَنَّ الجَوَّ رَبيعٌ. كَأَنَّهُ لا يَسْمَعُني.
• لٰكِنَّ - “but”. It needs a noun or pronoun after it: لٰكِنَّ الوَقْتَ قَصيرٌ، لٰكِنَّها رَفَضَتْ. Its lighter twin لٰكِنْ, with a sukūn and no shadda, governs nothing and may be followed by a verb: أَرَدْتُ أَنْ أَتَّصِلَ بِهِ لٰكِنْ نَسيتُ. Both are usually written without the small alif - لكِنَّ، لكِنْ - and both are pronounced with a long ā.
• لَيْتَ - “if only, I wish”, for something unlikely or impossible. لَيْتَ العُطْلَةَ أَطْوَلُ. يا لَيْتَني كُنْتُ مَعَكُمْ. The يا in front is optional and very common.
• لَعَلَّ - “perhaps, maybe, hopefully”, for something still possible. لَعَلَّ الطَّبيبَ يَعْرِفُ الحَلَّ. لَعَلَّكَ عَلى حَقٍّ.

7. إِنَّ versus أَنَّ: position decides, not meaning. These two are the same word grammatically - identical case effect, identical pronoun forms - and they split by where they stand.

• إِنَّ opens a sentence: at the very start, or after وَ or فَ (فَإِنَّ الوَضْعَ خَطيرٌ), or as the start of a quoted statement. A few fixed openers count as sentence-initial too; the one you will meet is حَيْثُ - حَيْثُ إِنَّ, “since”, never *حَيْثُ أَنَّ.
• أَنَّ is embedded. It is the “that” that hangs off a preceding word - a verb, a preposition, a fixed expression - and it can never begin a sentence.

أَعْتَقِدُ أَنَّ الطَّقْسَ سَيَتَحَسَّنُ. / سَمِعْتُ أَنَّ الأَسْعارَ اِرْتَفَعَتْ. / مِنَ المَعْروفِ أَنَّ التَّدْخينَ ضارٌّ. / أَعْلَنَتِ الوِزارَةُ أَنَّ الدِّراسَةَ تَبْدَأُ في أَيْلولَ.

أَنَّ also lives inside a set of very frequent compounds, worth learning as single items: لِأَنَّ (because), بِما أَنَّ (since), رَغْمَ أَنَّ / بِالرَّغْمِ مِنْ أَنَّ (although), مَعَ أَنَّ (even though), كَما أَنَّ (just as), بِأَنَّ (after verbs that take بِ - أَخْبَرَني بِأَنَّ). In every one the noun that follows is مَنْصوب: لِأَنَّ الجَوَّ بارِدٌ، رَغْمَ أَنَّهُ مَريضٌ.

8. After قالَ the particle is إِنَّ. Reported speech is the one place where the position rule looks broken - the clause is clearly embedded, yet Arabic uses إِنَّ. The clause after “say” is a quoted sentence, not a fact-object, so it keeps its sentence-opening particle.

قالَ إِنَّهُ مَريضٌ. / قالَ المُديرُ إِنَّ الاِجْتِماعَ سَيَبْدَأُ في التّاسِعَةِ. / تَقولُ الصَّحيفَةُ إِنَّ المُفاوَضاتِ مُسْتَمِرَّةٌ.

This holds for the whole family of قالَ - يَقولُ، قالَتْ، قيلَ، يُقالُ - and *قالَ أَنَّهُ is one of the most visible errors in learner Arabic. Two details come free with it. Arabic does not shift the tense back the way English does: قالَ إِنَّهُ مَريضٌ is “he said he was ill” - the predicate stays exactly as the speaker said it. And other verbs of communication are not verbs of saying, so they take أَنَّ normally: ذَكَرَ أَنَّ، أَضافَ أَنَّ، أَعْلَنَ أَنَّ، صَرَّحَ بِأَنَّ. Even قالَ switches to أَنَّ once a preposition intervenes - قالَ بِأَنَّهُ مَريضٌ, frequent in the press, though careful writers avoid it.

9. أَنْ، أَنَّ، إِنَّ - the three-way test. This is the point of the lesson. All three are “that” in English; none of them is interchangeable with another. Ask what comes next.

• A مُضارِع verb comes next -> أَنْ (sukūn, no shadda), and that verb goes مَنْصوب. This is lesson 34: أُريدُ أَنْ أَذْهَبَ، يَجِبُ أَنْ تَدْرُسَ.
• A noun or attached pronoun comes next, inside a larger sentence -> أَنَّ, and the noun goes مَنْصوب: أَعْتَقِدُ أَنَّ الطَّقْسَ سَيَتَحَسَّنُ، أَعْتَقِدُ أَنَّهُ سَيَتَحَسَّنُ.
• A noun or attached pronoun comes next and the clause starts the sentence, or follows قالَ -> إِنَّ: إِنَّ الطَّقْسَ جَميلٌ، قالَ إِنَّ الطَّقْسَ جَميلٌ.

“I think it will improve” and “I want it to improve” are twins in English and different machines in Arabic: أَعْتَقِدُ أَنَّهُ سَيَتَحَسَّنُ against أُريدُ أَنْ يَتَحَسَّنَ. In the first the pronoun sits on أَنَّ; in the second the person is on the verb, and nothing sits on أَنْ at all - أَنْ never takes a pronoun. One further word is nearby and is not part of this system: إِنْ with a sukūn is the conditional “if” (lesson 56) - same letters, no shadda, no case effect.

10. A verb may never follow the six directly. *إِنَّ يَذْهَبُ is impossible, and so is *لٰكِنَّ يَعْمَلُ. What comes next is the اسْم - a noun or an attached pronoun - or, in the pattern of rule 4, a fronted شِبْه جُمْلَة and then the اسْم. The repairs are mechanical: supply the noun (إِنَّ الوَلَدَ يَذْهَبُ), attach a pronoun (لٰكِنَّهُ يَعْمَلُ), or switch to a particle that takes a verb (لٰكِنْ يَعْمَلُ).

11. Read but do not write: اللّامُ المُزَحْلَقَة. In formal prose a لَـ is sometimes prefixed to the خَبَر: إِنَّ الطّالِبَ لَمُجْتَهِدٌ. It changes no case and is optional - recognise it, do not produce it.

12. Not in this lesson. أَنَّ and أَنْ with their clauses can be repackaged as a noun - المَصْدَرُ المُؤَوَّل - and that is lesson 54. The verbs that take two accusatives, ظَنَّ وأَخَواتُها, reshape a sentence in a third way again and wait for lesson 59.

Forms & patterns

The six sisters

إِنَّ with the attached pronouns

The two dual cells follow the same pattern and are left out only for length: إِنَّكُما، إِنَّهُما.

The same endings on the other five

How the نَصْب shows on اسْمِ إِنَّ

The mirror: كانَ against إِنَّ

They stack, in that order: إِنَّ الطّالِبَ كانَ مُجْتَهِدًا، إِنَّ الجَوَّ كانَ بارِدًا أَمْسِ.

Choosing between أَنْ، أَنَّ، إِنَّ

Examples

Common mistakes

• إِنَّ الطّالِبُ مُجْتَهِدٌ. -> إِنَّ الطّالِبَ مُجْتَهِدٌ. - The اسْم takes the fatḥa and the خَبَر keeps its ḍamma. Leaving both words مَرْفوع is the single most frequent إِنَّ error.
• قالَ أَنَّهُ مَريضٌ. -> قالَ إِنَّهُ مَريضٌ. - After قالَ and everything built on it the particle is إِنَّ, because what follows is a quoted sentence, not a fact-object.
• أَعْتَقِدُ أَنْ الطَّقْسَ سَيَتَحَسَّنُ. -> أَعْتَقِدُ أَنَّ الطَّقْسَ سَيَتَحَسَّنُ. - أَنْ takes a verb, أَنَّ takes a noun. A noun after أَنْ is always the wrong particle.
• أُريدُ أَنَّ أُسافِرَ. -> أُريدُ أَنْ أُسافِرَ. - The mirror error: with a verb behind it, the word is the bare أَنْ of lesson 34, sukūn and no shadda.
• إِنَّ هُوَ طَبيبٌ. -> إِنَّهُ طَبيبٌ. - An independent pronoun has no case and cannot be اسْمُ إِنَّ. Use the attached set: إِنَّهُ، إِنَّها، إِنَّكَ، إِنَّني.
• إِنَّ يَذْهَبُ إِلى العَمَلِ مُبَكِّرًا. -> إِنَّهُ يَذْهَبُ إِلى العَمَلِ مُبَكِّرًا. - إِنَّ cannot be followed by a verb; the اسْم comes first, and a verb can only come later, as the خَبَر.
• إِنَّ الطُّلّابَ مُجْتَهِدينَ. -> إِنَّ الطُّلّابَ مُجْتَهِدونَ. - Only the first word changes. The خَبَر stays مَرْفوع, and here that means ـونَ, not ـينَ.
• أَنَّ الأَسْعارَ اِرْتَفَعَتْ هٰذا العامَ. -> إِنَّ الأَسْعارَ اِرْتَفَعَتْ هٰذا العامَ. - أَنَّ can never open a sentence. If nothing precedes it, the word you want is إِنَّ.
• إِنَّ رَجُلًا في البَيْتِ. -> إِنَّ في البَيْتِ رَجُلًا. - An indefinite اسْم needs a شِبْه جُمْلَة predicate in front of it. Move the preposition phrase forward.
• لٰكِنَّ نَسيتُ أَنْ أَتَّصِلَ بِهِ. -> لٰكِنْ نَسيتُ أَنْ أَتَّصِلَ بِهِ. - Before a verb use the light لٰكِنْ. The heavy لٰكِنَّ needs a noun or a pronoun: لٰكِنَّني نَسيتُ.

Tips

• One question sorts the whole family: which word changed? Predicate moved to the accusative -> كانَ’s family. Subject moved to the accusative -> إِنَّ’s family. Nothing moved -> neither.
• Learn the compounds as whole words, not as أَنَّ plus something: لِأَنَّ، رَغْمَ أَنَّ، بِما أَنَّ، مَعَ أَنَّ، مِنَ المَعْروفِ أَنَّ. The case rule rides along inside them.
• Drill the pronoun forms out loud in one string - إِنَّني، إِنَّكَ، إِنَّهُ، إِنَّها، إِنَّنا، إِنَّهُمْ - then swap the head: أَنَّهُ، لٰكِنَّها، لَعَلَّكَ، لَيْتَنا. It is one list, not six.
• For the أَنْ / أَنَّ choice, do not translate from English at all. Look ahead: verb -> أَنْ; noun -> أَنَّ. It takes half a second and it is never wrong.
• Take قالَ إِنَّ as a fixed collocation and rehearse it attached: قالَ إِنَّ… قالَتْ إِنَّ… يَقولونَ إِنَّ… Then the embedded-versus-initial logic never gets a chance to interfere.
• In news writing, watch for فَإِنَّ: after a fronted phrase the main statement is regularly opened with فَـ + إِنَّ - أَمّا الأَسْعارُ فَإِنَّها مُسْتَقِرَّةٌ. It is still ordinary إِنَّ.
• A شِبْه جُمْلَة has nothing to give: in إِنَّ في البَيْتِ رَجُلًا the preposition phrase is untouched, and the accusative lands on the noun that follows it.
• Do not go hunting yet for المَصْدَرُ المُؤَوَّل (lesson 54) or for ظَنَّ وأَخَواتُها (lesson 59). One particle, one accusative, one nominative is a complete and immediately usable skill.