Coordination joins a word to an earlier one through a particle, and the second word takes the case of the first: jāʾa Muḥammadun wa-ʿAliyyun, where ʿAliyyun is nominative like Muḥammadun. The particles are wa, fa, thumma, ḥattā, aw, am, bal, lā, and lākin, each with its own meaning.
Coordination is the easiest rule in the grammar and one of the richest chapters in meaning. The rule is that the coordinated word takes the case of what it is coordinated onto, without exception. The richness is in the particles: Arabic distinguishes joining without order, joining in immediate sequence, and joining after a delay, where English has only the word and.
The coordinated word takes the case of the word before it, and the particle is built with no position of its own.
By the end of this lesson
أَكْرَمْتُ الطَّالِبَ وَالْمُعَلِّمَ فِي الْمَدْرَسَةِ وَالْبَيْتِ
akramtu l-ṭāliba wa-l-muʿallima fī l-madrasati wa-l-bayti
I honoured the student and the teacher, in the school and the house.
أكرمتُ فعل وفاعل، الطالبَ مفعول به منصوب، الواو حرف عطف، المعلمَ معطوف على الطالب منصوب وعلامة نصبه الفتحة الظاهرة، في حرف جر، المدرسةِ اسم مجرور، الواو حرف عطف، البيتِ معطوف على المدرسة مجرور وعلامة جره الكسرة الظاهرة.
The same particle produces an accusative in one place and a genitive in the other, because it simply passes on whatever case it finds. Say what the word is coordinated onto, not merely that it is coordinated.
Four join in both ruling and case; five carry finer rulings.
The three of sequence deserve attention because English flattens them. Wa asserts nothing about order at all, so a Quranic wa should not be read as "and then".
A verb coordinated onto a verb takes its case, including the jussive. A sentence coordinated onto a sentence takes its position when it has one.
إِنَّهُ مَنْ يَتَّقِ وَيَصْبِرْ فَإِنَّ اللهَ لَا يُضِيعُ أَجْرَ الْمُحْسِنِينَ
innahu man yattaqi wa-yaṣbir fa-inna Llāha lā yuḍīʿu ajra l-muḥsinīn
Indeed whoever fears Allah and is patient, Allah does not waste the reward of the doers of good.
من اسم شرط جازم مبني في محل رفع مبتدأ، يتقِ فعل مضارع مجزوم فعل الشرط وعلامة جزمه حذف حرف العلة، الواو حرف عطف، يصبرْ فعل مضارع مجزوم معطوف على يتق وعلامة جزمه السكون، الفاء واقعة في جواب الشرط.
Two jussive verbs with two different markers: a deleted weak letter on the first, sukūn on the second. The second is jussive purely by coordination, not because any particle reached it. Note also the fāʾ before the answer, required because it is a nominal sentence.
Check yourself
What case is the second verb, and why?
لَمْ يَكْتُبْ وَلَمْ يَقْرَأْ
Jussive, and here by its own particle rather than by coordination.
lam is repeated before the second verb, so it governs directly. Had it been lam yaktub wa-yaqraʾ, the second would have been jussive by coordination onto the first. Both readings are grammatical; the wording of the iʿrāb differs.
Coordinating onto an attached nominative pronoun requires that the pronoun first be emphasised by a detached one, or that something separate the two.
اسْكُنْ أَنْتَ وَزَوْجُكَ الْجَنَّةَ
uskun anta wa-zawjuka l-jannata
Dwell, you and your wife, in the Garden.
اسكنْ فعل أمر مبني على السكون، والفاعل ضمير مستتر وجوبًا تقديره أنت، أنتَ ضمير منفصل مبني في محل رفع توكيد للضمير المستتر، الواو حرف عطف، زوجُك معطوف على الضمير المستتر مرفوع وعلامة رفعه الضمة الظاهرة وهو مضاف، الجنةَ مفعول به منصوب.
The doer of uskun is a hidden pronoun. Coordinating a noun onto it directly would be disliked, so anta is brought in to emphasise it first, and the coordination then attaches to the emphasised pronoun. This is the rule in action rather than in the abstract.
Two errors, and the second is about meaning rather than case.
The particles and their meanings follow these texts.
A rule is clearest in a text you already know by heart. Each ayah below contains the very construction this lesson teaches, and every one has a full word-by-word i'rab on this site. Read the ayah first and try to find the construction yourself, then open its i'rab to check.
Common questions
The same as the word it is coordinated onto, in every case: nominative onto nominative, accusative onto accusative, genitive onto genitive, and jussive onto jussive when verbs are coordinated. The particle itself is built and has no position in iʿrāb.
wāw joins without implying order at all: jāʾa Zaydun wa-ʿAmrun says nothing about who came first. fāʾ implies order with immediacy. thumma implies order with delay. English "and" covers all three, which is why translations lose the distinction.
After a command, if the two options may not be combined it is choice: tazawwaj Hindan aw Zaynaba. If they may, it is permission: jālis al-ʿulamāʾa aw al-zuhhāda, where sitting with both is allowed. After a statement it usually indicates doubt or vagueness.
Yes, and it takes the same case: man yattaqi wa-yaṣbir has both verbs jussive, the second by coordination onto the first. Whole sentences may also be coordinated, taking the position of the sentence they follow if it has one.
The pronoun must be emphasised by a detached one, or something must separate the two. So uskun anta wa-zawjuka l-jannata has anta emphasising the implied doer before wa-zawjuka is coordinated onto it. Without that emphasis the coordination is disliked.
lā negates of the second what was affirmed of the first: jāʾa Zaydun lā ʿAmrun. bal transfers the ruling from the first to the second, retracting it. lākin restores a ruling after a negation: mā jāʾa Zaydun lākin ʿAmrun. All three keep the case of what precedes.