In short

Lesson 2 gave you a sentence with no verb in it (البَيْتُ كَبيرٌ), and lessons 14 and 18 gave you verbs that carry their own subject inside them (أَذْهَبُ، ذَهَبْتُ). This lesson joins the two halves: a verb with a noun as its subject. Arabic’s neutral, unmarked way of doing that is to put the verb first - ذَهَبَ الطُّلّابُ, word for word “went the students”. A sentence that opens with a verb is called الجُمْلَةُ الفِعْلِيَّةُ, and the noun that does the action is الفاعِل.

The catch, and the whole point of this lesson, is that Arabic gives you two orders and they do not agree the same way. Put the verb first and it stays singular, matching only the gender of the subject: ذَهَبَ الطُّلّابُ. Put the subject first and the verb agrees with it fully, in gender and number: الطُّلّابُ ذَهَبوا. Same meaning, same words, two different verb forms. Get this asymmetry into your ear now and you will never write the sentence that Arab grammarians nicknamed after a plague of fleas.

The rule

1. What a verbal sentence is. A جُمْلَة فِعْلِيَّة begins with the verb. Its two obligatory parts are:

• الفِعْل - the verb: ذَهَبَ، وَصَلَ، يَجْلِسُ.
• الفاعِل - the doer, the noun (or pronoun) that performs the action: الطُّلّابُ، الرَّسائِلُ.

Anything else - a prepositional phrase, a time word - normally follows them: ذَهَبَ الطُّلّابُ إِلَى المَدْرَسَةِ. In this lesson every verb is either intransitive or takes its complement through a preposition, so that الفاعِل is the only noun whose ending you have to think about.

2. Verb first is the default. In news writing, narrative and neutral statements MSA reaches for فِعْل + فاعِل before anything else: وَصَلَ الضُّيوفُ. English cannot do this at all, so the order feels strange for about a week and then stops feeling like anything. The subject-first order الطُّلّابُ ذَهَبوا is equally correct Arabic and very common in modern prose, but it is not neutral: it puts the spotlight on the subject, in the way English does with “the students - they went”. Start a plain statement with the verb.

3. Verb first: the verb stays singular and matches gender only. This is the rule that has no English parallel. When the verb comes before its فاعِل, it is always singular, whatever the number of the subject. The only thing it copies is gender - the ت of the feminine:

• masculine subject, any number: ذَهَبَ الطّالِبُ / ذَهَبَ الطّالِبانِ / ذَهَبَ الطُّلّابُ
• feminine subject, any number: ذَهَبَتِ الطّالِبَةُ / ذَهَبَتِ الطّالِبَتانِ / ذَهَبَتِ الطّالِباتُ

Read the two columns down. The verb never moves. Number lives in the noun and nowhere else, so ذَهَبَ الطُّلّابُ is not “he went, the students” - the verb is simply neutral about number here, and the plural noun says everything.

The feminine ت is not optional in modern usage. A group of women takes it exactly as one woman does: وَصَلَتِ المُعَلِّماتُ, never *وَصَلَ المُعَلِّماتُ.

4. Subject first: full agreement. Move the noun in front and the verb must match it completely

• gender and number, using the whole paradigm of lesson 18:

• الطّالِبُ ذَهَبَ - الطّالِبَةُ ذَهَبَتْ

• الطّالِبانِ ذَهَبا - الطّالِبَتانِ ذَهَبَتا

• الطُّلّابُ ذَهَبوا - الطّالِباتُ ذَهَبْنَ

There is a reason, and it is worth twenty rules of memorization. When the noun comes first, the sentence is really a nominal sentence of the kind you built in lesson 2: الطُّلّابُ is the مُبْتَدَأ, and everything after it is the predicate. The verb ذَهَبوا already contains its own subject - the و is the pronoun “they” - and that pronoun points back at الطُّلّاب. So the verb is not agreeing with a following noun; it is carrying a pronoun, and a pronoun is always fully specified. Verb-first sentences have no such pronoun, because the real doer is standing right there behind the verb.

5. Non-human plurals ignore the whole thing. Lesson 11 taught that a plural of غَيْرِ العاقِل - things, animals, ideas - takes feminine singular agreement. That rule outranks this one and applies in both orders:

• verb first: وَصَلَتِ الرَّسائِلُ. / تَصِلُ الطّائِراتُ فِي الصَّباحِ.
• subject first: الكُتُبُ وَصَلَتْ. / السَّيّاراتُ وَصَلَتْ.

For a non-human plural, then, the two orders look the same, and you have one form to worry about instead of two. Never *الرَّسائِلُ وَصَلْنَ - ـْنَ is for groups of women.

6. الفاعِل is مَرْفوع - always. The subject of a verbal sentence carries the nominative ending, and a word list or a dictionary will not show it to you. طالب in your vocabulary notebook becomes الطّالِبُ or طالِبٌ the moment it enters a sentence:

• singular and broken plural: ḍamma - الطّالِبُ، طالِبٌ، الطُّلّابُ، طُلّابٌ
• sound feminine plural: ḍamma - الطّالِباتُ، طالِباتٌ
• dual: the ending ـانِ - الطّالِبانِ، طالِبانِ
• sound masculine plural: the ending ـونَ - المُعَلِّمونَ، مُعَلِّمونَ

Two of these are the traps. المُعَلِّمينَ is a real word, but it is not a فاعِل; as the subject of a verb it must be المُعَلِّمونَ. And a fatḥa on the subject - *ذَهَبَ الطّالِبَ - turns it into something the verb is done to, which is the topic of lesson 29 and is not what you mean here.

7. The junction kasra: ذَهَبَتِ الطّالِباتُ. The feminine past ending ـَتْ has a sukūn. The article الـ opens with هَمْزَةُ الوَصْل, which disappears in the flow of speech and leaves its lām - or, before a sun letter, the doubled consonant - with a sukūn of its own. Two sukūns cannot meet: this is اِلْتِقاءُ السّاكِنَيْنِ. Arabic breaks the collision by giving the first one a kasra:

• ذَهَبَتْ + الطّالِباتُ → ذَهَبَتِ الطّالِباتُ
• وَصَلَتْ + الرَّسائِلُ → وَصَلَتِ الرَّسائِلُ
• خَرَجَتْ + النِّساءُ → خَرَجَتِ النِّساءُ

It is audible - the extra vowel is clearly heard - but it is visible only in vocalized text, so in an ordinary newspaper the word still looks like ذهبت. The sukūn comes straight back when the next word does not begin with هَمْزَةُ الوَصْل: ذَهَبَتْ إِلَى المَدْرَسَةِ، وَصَلَتْ أَمْسِ. Nothing like this happens with masculine ذَهَبَ, which already ends in a vowel.

8. Pronoun subjects need no noun at all. If the doer is a pronoun, the verb form is the subject: ذَهَبْتُ، ذَهَبْنا، ذَهَبوا. You do not add an independent pronoun to supply it - ذَهَبَ هُمْ is not Arabic - and you do not need one in front of it either. أَنا ذَهَبْتُ is possible, but like أَنا أَكْتُبُ in lesson 14 it is emphasis, not grammar.

9. The rule holds under everything you know so far. A question word or a particle in front does not change what happens between the verb and its subject:

• هَلْ وَصَلَ الضُّيوفُ؟
• مَتى رَجَعَتِ المُعَلِّماتُ؟
• جَلَسَ الرِّجالُ تَحْتَ الشَّجَرَةِ وضَحِكوا.

That last one shows the natural rhythm of Arabic prose: once the subject has been named, the following verbs in the chain refer back to it with a pronoun inside them, so they take the full plural form.

10. The error with a name. Saying *ذَهَبوا الطُّلّابُ - a fully agreeing verb standing before its noun subject - is the classic mistake, and Arab grammarians labelled it أَكَلوني البَراغيثُ, “the fleas ate me”, after the shape of the sentence. A minority of old tribal dialects did it, and grammarians recorded that; standard written Arabic does not accept it. Choose one: verb first with a singular verb, or subject first with a full one.

11. Left for later. The noun that the action is done to - المَفْعولُ بِهِ, with its accusative ending - is lesson 29, and the sentences here avoid it. A verbal sentence with no mentioned doer at all (نائِبُ الفاعِل, “the letter was written”) is lesson 52. Past-tense sentences built on كانَ are lesson 32. The complete system of case endings and their sub-markers is lesson 40.

Forms & patterns

The core table. One verb, six subjects, two orders - the whole lesson is in the difference between the two right-hand columns.

The same asymmetry in the present tense - المُضارِع behaves exactly like الماضي here:

Human against non-human, on وَصَلَ. Note that the bottom two rows are identical across the columns: a plural of things has only one shape.

The ending on the فاعِل, definite and indefinite. This is the nominative and nothing else:

The junction kasra, before and after:

Left out here: everything the verb might govern after its subject - objects, adverbials of time and place, and the accusative endings they carry.

Examples

Common mistakes

• ذَهَبوا الطُّلّابُ إِلَى المَدْرَسَةِ. -> ذَهَبَ الطُّلّابُ إِلَى المَدْرَسَةِ. - this is أَكَلوني البَراغيثُ. Before its noun subject the verb is singular; the plural form ـوا already contains a subject of its own.
• ذَهَبَ الطّالِباتُ. -> ذَهَبَتِ الطّالِباتُ. - verb-first drops number, not gender. A feminine subject still pulls the ـَتْ onto the verb.
• ذَهَبَ الطّالِبَ. -> ذَهَبَ الطّالِبُ. - الفاعِل is مَرْفوع. A fatḥa here says the student was the thing that got gone, which is neither the meaning nor a possible reading of ذَهَبَ.
• ذَهَبَ المُعَلِّمينَ. -> ذَهَبَ المُعَلِّمونَ. - the nominative of a sound masculine plural is ـونَ. المُعَلِّمينَ is the form for other positions in the sentence.
• الطُّلّابُ ذَهَبَ. -> الطُّلّابُ ذَهَبوا. - the asymmetry runs one way only. Once the subject is in front, the verb must agree with it fully.
• ذَهَبا الطّالِبانِ. -> ذَهَبَ الطّالِبانِ. - the dual is no exception: a verb standing first is singular even when its subject is two people.
• الطّالِباتُ ذَهَبوا. -> الطّالِباتُ ذَهَبْنَ. - ـوا is for men and mixed groups. A group of women in front of its verb takes ـْنَ.
• الرَّسائِلُ وَصَلْنَ. -> الرَّسائِلُ وَصَلَتْ. - letters are غَيْرُ العاقِل, so the verb is feminine singular in either order. ـْنَ would make the letters into women.
• ذَهَبَتْ الطّالِباتُ. (pronounced with a sukūn) -> ذَهَبَتِ الطّالِباتُ. - two sukūns cannot meet across the article, so the ت takes a kasra. Write it and say it.
• ذَهَبَ هُمْ إِلَى السّوقِ. -> ذَهَبوا إِلَى السّوقِ. - a pronoun subject lives inside the verb, and a هُمْ standing after ذَهَبَ cannot do that job for it.

Tips

• Memorize the contrast as a two-line chant, not as a rule: ذَهَبَ الطُّلّابُ / الطُّلّابُ ذَهَبوا. Say it until the wrong pairing sounds off.
• Ask one question before you choose the verb form: “is the subject in front of me or behind me?” Behind → singular, gender only. In front → the full form from the paradigm.
• Default to verb first when you write. It is the neutral order, and it is also the easier one: you only ever need two shapes of the verb, the plain one and the one with ـَتْ.
• Watch the ending of the subject as closely as the verb. Most learner sentences that feel “off” to a reader are correct in agreement and wrong in the ـُ / ـونَ / ـانِ on the noun.
• For non-human plurals, stop thinking about this lesson entirely and think about lesson 11: one feminine singular verb, both orders, done.
• The kasra of ذَهَبَتِ الطّالِباتُ is worth practising out loud even though you will rarely see it printed. It is one of the small things that makes read-aloud Arabic sound right.
• Do not try to use this order with an object yet. Keep to verbs of going, arriving, sitting, working and playing, and let lesson 29 add the second noun.