In short

Lesson 32 taught you one verb and one case rule: put كانَ in front of a verbless sentence, and the first noun keeps its ḍamma while the second takes a fatḥa - كانَ الطَّقْسُ بارِدًا. That machine was never about كانَ alone. Arabic has a small closed set of words that all do exactly the same thing, and grammarians call them أَخَواتُ كانَ, “the sisters of كانَ”.

There are nine you actually need. Each one adds a shade of meaning to the sentence - became, turned out, stayed, is still, as long as, is not - and each one leaves the sentence’s structure untouched: اسْمُها مَرْفوع، خَبَرُها مَنْصوب. So the grammar of this lesson is one line you already know, and the work is elsewhere: learning what each sister means, and surviving their stems. Five of them are hollow (كانَ، صارَ، باتَ، زالَ، دامَ) and lose their long vowel without warning, one is doubled (ظَلَّ), and one refuses to appear without a negative particle glued to its front (ما زالَ). Those three facts cause nearly every error in this lesson.

The rule

1. One machine, nine operators. Take any nominal sentence - مُبْتَدَأ plus خَبَر - and put a sister in front of it. The مُبْتَدَأ is renamed اسْمُها, “its noun”, and keeps its مَرْفوع ending; the خَبَر is renamed خَبَرُها and goes مَنْصوب. Nothing is deleted, nothing is reordered:

الطَّقْسُ بارِدٌ. → كانَ الطَّقْسُ بارِدًا. / أَصْبَحَ الطَّقْسُ بارِدًا. / ما زالَ الطَّقْسُ بارِدًا. / لَيْسَ الطَّقْسُ بارِدًا.

Four different meanings, one identical piece of grammar. If you can produce the كانَ sentence, you can produce all four; only the front word changes.

2. What each sister adds. They fall into three meaning groups, and it is worth learning them in groups rather than as a list of nine:

• becoming - أَصْبَحَ، صارَ، أَمْسى، باتَ: the subject was not X and now is X.
• staying - ظَلَّ، ما زالَ / لا يَزالُ، ما دامَ: the subject was X and still is.
• negating - لَيْسَ: the subject is not X, right now.

كانَ itself belongs to none of them: it adds only past time.

3. أَصْبَحَ، أَمْسى، باتَ once told the time, and no longer do. Their roots are transparent - صَباحٌ “morning”, مَساءٌ “evening”, باتَ يَبيتُ “spend the night” (the root of بَيْتٌ “house”) - and أَصْبَحَ once meant “he became X in the morning”. In modern written Arabic that clock has faded out almost completely: أَصْبَحَ is simply the ordinary word for “became”, used at any hour, and it is the commonest sister after كانَ. أَمْسى keeps a faint evening flavour and is much rarer; باتَ is now a favourite of journalists meaning “has come to be, is now” - باتَ الأَمْرُ واضِحًا “the matter is now clear”. Do not translate the time back in.

4. صارَ is the neutral “become”. أَصْبَحَ and صارَ overlap almost entirely: صارَ الوَلَدُ طَبيبًا = أَصْبَحَ الوَلَدُ طَبيبًا, with أَصْبَحَ a shade more formal on the page. Neither needs a preposition - Arabic says صارَ مُدَرِّسًا, with a bare accusative, where English needs “became a teacher”.

5. ظَلَّ means “stayed”, not “became”. ظَلَّ is “kept on being, remained”: ظَلَّ البابُ مَفْتوحًا “the door stayed open”. It is the sister you want for a state that persisted through a stretch of past time, and it very often takes a مُضارِع predicate: ظَلَّ يَنْتَظِرُ ساعَتَيْنِ “he kept waiting for two hours”.

6. ما زالَ and لا يَزالُ never appear bare. This is the one form-fact of the lesson that has nothing to do with case. The verb زالَ on its own means “to cease, to go away” - so the sentence needs a negation to say “has not ceased to be”, i.e. “is still”. The negative is not optional and it is not detachable:

• past shape: ما زالَ الطَّريقُ مُغْلَقًا. - The road is still closed.
• present shape: لا يَزالُ الطَّريقُ مُغْلَقًا. - The road is still closed.

Both mean the present. Choose by the person you need: ما زِلْتُ، ما زالَتْ، ما زالوا on one side, لا أَزالُ، لا تَزالُ، لا يَزالونَ on the other. What you may never write is *زالَ يَعْمَلُ - without ما it says the opposite of what you mean. (ما is the ما of lesson 37, negating a past verb; لا is the لا of lesson 23, negating a مُضارِع. Nothing new, just fused into an idiom.)

The other “still” sisters - ما بَرِحَ، ما انْفَكَّ، ما فَتِئَ - behave identically and are worth recognising, but ما زالَ / لا يَزالُ will carry everything you need to say.

7. ما دامَ always leans on a main clause. ما دامَ means “as long as, so long as”, and unlike the others it cannot stand as a sentence by itself - it introduces a subordinate clause attached to a main one: اِقْرَأْ ما دُمْتَ مُسْتَيْقِظًا “read as long as you are awake”; ما دامَ الطَّقْسُ جَميلًا فَلْنَخْرُجْ “as long as the weather is fine, let’s go out”. It appears only in the past shape (ما دامَ، ما دُمْتَ، ما دامَتْ) whatever the time meaning, and the ما here is not a negation - it is a different ما entirely, one you will meet again in lesson 68.

8. لَيْسَ is the family’s present-tense negator. You met it in lesson 23 and it has not changed: لَيْسَ الجَوابُ سَهْلًا. Two things distinguish it from its sisters. It is جامِد - frozen: there is no مُضارِع *يَلْيَسُ and no أَمْر, only the past-shaped forms, which nonetheless mean the present. And to negate any of the other sisters in the past you do not use it at all - you use ما or لَمْ on the sister itself: ما كانَ الجَوُّ جَميلًا / لَمْ يَكُنِ الجَوُّ جَميلًا.

9. Five sisters are أَجْوَف, and their stems shorten. كانَ (ك-و-ن)، صارَ (ص-ي-ر)، باتَ (ب-ي-ت)، زالَ (ز-ي-ل)، دامَ (د-و-م) all have a weak middle radical stretched into a long alif in the third person. A long vowel cannot stand in front of a sukūn, so the moment you add a consonant-initial ending the alif collapses to a short vowel - and in these five the short vowel matches the hidden radical: و gives a ḍamma, ي gives a kasra. (That shortcut is not the general rule for hollow verbs: نامَ - يَنامُ has a و and still gives نِمْتُ. Lesson 50 sorts it out.)

كانَ → كُنْتُ ، صارَ → صِرْتُ ، باتَ → بِتُّ ، ما زالَ → ما زِلْتُ ، ما دامَ → ما دُمْتُ

Endings that begin with a vowel leave the long alif alone: كانَتْ، كانوا، صارَتْ، صاروا، ما زالوا. The same collapse happens in the مُضارِع whenever the jussive puts a sukūn on the end: يَكونُ → لَمْ يَكُنْ، يَصيرُ → لَمْ يَصِرْ. The collapse itself is what every hollow verb does - lesson 50 makes it a general rule - and it explains بِتُّ, where the shortened stem بِتْ meets the ـتُ ending and the two تs merge under a shadda.

10. ظَلَّ is مُضَعَّف, and it un-doubles. ظَلَّ hides a repeated radical: ظ-ل-ل. The two لs sit together under a shadda as long as the ending is a vowel (ظَلَّ، ظَلَّتْ، ظَلّوا، يَظَلُّ), but a consonant-initial ending forces them apart and the original stem vowel resurfaces as a kasra: ظَلِلْتُ، ظَلِلْنا، ظَلِلْتُمْ. There is no *ظَلَّتُ. This is exactly the same trigger as the hollow collapse - a consonant-initial ending - applied to a different weakness.

11. The خَبَر can be a whole clause or a شِبْه جُمْلَة. A one-word predicate goes مَنْصوب; anything bigger has no ending to change, and then the sister simply stands there:

• جُمْلَة فِعْلِيَّة: كانَ الوَلَدُ يَلْعَبُ في الحَديقَةِ. / أَصْبَحَتْ تَتَكَلَّمُ العَرَبِيَّةَ بِطَلاقَةٍ.
• شِبْه جُمْلَة: كانَ في البَيْتِ. / ما زالَ الكِتابُ عَلَى الطّاوِلَةِ.

In the first group the مُضارِع keeps its ordinary مَرْفوع ending - يَلْعَبُ, never *يَلْعَبَ - because a sentence has no case. كانَ plus a مُضارِع is the “used to / was doing” pattern of lesson 32; كانَ plus a past verb is a different construction, the past perfect, and it needs قَدْ - كانَ قَدْ خَرَجَ. That whole compound-tense system is lesson 45; leave it there for now.

12. Order can move, the cases cannot. Arabic will happily front the خَبَر when the اسْم is indefinite: كانَ في القاعَةِ طُلّابٌ كَثيرونَ “there were many students in the hall”. Read that slowly - طُلّابٌ is مَرْفوع because it is the delayed اسْمُ كانَ, not the predicate. The reflex “كانَ means an accusative somewhere” is what produces the classic *كانَ عِنْدي كِتابًا. Identify which word is the predicate first, then apply the case.

13. You often cannot hear the accusative, and you can never see it unvocalized. Case endings die at a pause and are simply absent from ordinary Arabic print. But the accusative is the one that partly survives: at a pause the tanwīn of بارِدًا drops while its alif stays, so كانَ الطَّقْسُ بارِدا really does end in an audible long ā, and مَريضًا is audibly different from مَريضٌ. What you do not hear is the ـةً of مَريضَةً (at a pause it is just مَريضَهْ), the ـٍ of مُجْتَهِداتٍ, or the bare fatḥa of a definite predicate. So half the rule is audible and half of it is knowledge - which is why you write the ending even when nobody would pronounce it.

14. Not in this lesson. Two neighbouring families look similar and are deliberately held back. كادَ “almost” and ظَنَّ “thought” also reshape the sentence, but ظَنَّ takes two accusatives, not one - that is lesson 59. إِنَّ and its sisters do the mirror image of this lesson, accusative first and nominative second - lesson 44, immediately next. And كانَ inside an unreal condition (لَوْ كانَ عِنْدي وَقْتٌ) waits for lesson 65.

Forms & patterns

The nine sisters

كانَ: the shortening in one table (the pattern every hollow sister copies)

The five hollow sisters side by side

The non-hollow sisters

One sentence through the whole family

What the خَبَر can be

Examples

Common mistakes

• كانَ الطَّقْسُ بارِدٌ. -> كانَ الطَّقْسُ بارِدًا. - The خَبَر of every sister is مَنْصوب. Leaving it مَرْفوع is the error the whole family exists to catch.
• أَصْبَحَتِ المَدينَةُ كَبيرَةٌ. -> أَصْبَحَتِ المَدينَةُ كَبيرَةً. - The rule is not about كانَ, it is about the family. Every sister pulls its predicate into the accusative.
• زالَ يَعْمَلُ في الشَّرِكَةِ. -> ما زالَ يَعْمَلُ في الشَّرِكَةِ. / لا يَزالُ يَعْمَلُ في الشَّرِكَةِ. - Bare زالَ means “he stopped”. The negative particle is part of the word, not an optional extra.
• كانَ الطّالِبَ مُجْتَهِدًا. -> كانَ الطّالِبُ مُجْتَهِدًا. - The cases reversed. اسْمُ كانَ is مَرْفوع and only the second element moves; two accusatives in a row is impossible here.
• صارْتُ مُعَلِّمًا. -> صِرْتُ مُعَلِّمًا. - A long alif cannot stand before a sukūn. The hollow stem collapses, and the ي of ص-ي-ر leaves a kasra behind.
• ظَلَّتُ أَنْتَظِرُ. -> ظَلِلْتُ أَنْتَظِرُ. - A doubled verb splits its shadda before a consonant-initial ending. (ظَلَّتْ, with a sukūn, is the perfectly good “she stayed”.)
• لَيْسَ الجَوابُ سَهْلٌ. -> لَيْسَ الجَوابُ سَهْلًا. - لَيْسَ is a sister like the rest, and it has been governing an accusative since lesson 23.
• كانَ عِنْدي وَقْتًا كَثيرًا. -> كانَ عِنْدي وَقْتٌ كَثيرٌ. - Here عِنْدي is the predicate and وَقْتٌ is the delayed اسْمُ كانَ, so it stays مَرْفوع. Find the predicate first.
• أَصْبَحَ الوَلَدُ يَلْعَبَ في الحَديقَةِ. -> أَصْبَحَ الوَلَدُ يَلْعَبُ في الحَديقَةِ. - A clause predicate has no case to take, so the مُضارِع keeps its ordinary ḍamma.
• لَيْسَ كانَ الجَوُّ جَميلًا. -> ما كانَ الجَوُّ جَميلًا. / لَمْ يَكُنِ الجَوُّ جَميلًا. - لَيْسَ negates a nominal sentence; it never negates a past verb. Past كانَ is negated with ما or لَمْ (lesson 37).

Tips

• Learn the family as one sentence run through all of it - الطَّقْسُ بارِدٌ → كانَ / أَصْبَحَ / ظَلَّ / ما زالَ / لَيْسَ الطَّقْسُ بارِدًا. Nine meanings for the price of one syntax rule.
• Sort them by group before you memorise: four “become”, three “stay”, one “is not”, one bare past. Nine unconnected items is hard; four labelled boxes is not.
• The stem test is always the same question: does the ending begin with a consonant? If yes, كانَ → كُنْ، صارَ → صِرْ، باتَ → بِتْ، زالَ → زِلْ، دامَ → دُمْ، ظَلَّ → ظَلِلْ. If no, leave the stem alone.
• Store ما زالَ and لا يَزالُ as single words with the negative baked in, exactly as you store English “no longer”. You will then never be tempted to strip the ما off.
• باتَ and أَصْبَحَ are all over the news; ظَلَّ and ما زالَ are all over ordinary description; أَمْسى you mostly need to recognise. Spend your effort accordingly.
• Say the predicate out loud with its alif attached - بارِدًا، واضِحًا، مَفْتوحًا. It is the one ending in this lesson your listener will actually hear, so it repays drilling more than the silent ones do.
• Do not reach yet for كادَ يَسْقُطُ or ظَنَّ الوَلَدَ نائِمًا. They look like this family and behave differently; lesson 59 is where they belong.