Perception and Cognition Complements | Arabic (Modern Standard) Grammar

Arabic does not have one universal equivalent of English see/hear/think/know + that. Verbs of physical perception, discovery, belief, and judgment select different complement structures: a direct object, an object plus a circumstantial predicate, a finite scene, an أنّ proposition, or an أنْ event.

The hard part is lexical valency: you must learn what each verb licenses. The form of the complement then signals how the speaker construes the information—as an entity perceived, a scene witnessed, a proposition accepted as true, or an action considered.

For the unusually broad meanings and complement frames of رأى, consult the رأى reference page.

Direct perception: an object or a witnessed scene

Physical رأى “see” can take an ordinary direct object:

رأيت الحافلة عند مدخل المحطة

raʾaytu l-ḥāfilata ʿinda madkhali l-maḥaṭṭa(h)

I saw the bus at the station entrance.

To describe the object's state at the moment of perception, Arabic can add an accusative circumstantial expression (حال):

رأيت الباب مفتوحا حين وصلت

raʾaytu l-bāba maftūḥan ḥīna waṣalt

I saw the door open when I arrived.

البابَ is the object perceived; مفتوحًا describes its state during that perception. English uses a bare adjective, but Arabic marks the circumstantial predicate accusative.

A finite imperfect clause can present an unfolding scene. Its verb is indicative unless another particle governs it:

رأيت الأطفال يركضون نحو الحافلة

raʾaytu l-ʾaṭfāla yarkuḍūna naḥwa l-ḥāfila(h)

I saw the children running toward the bus.

The five-verb form يركضونَ retains its nūn. Nothing in physical رأيت makes the scene subjunctive.

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After physical perception, ask whether you perceived an entity, its state, or an event unfolding. Arabic can encode those as object alone, object + accusative ḥāl, or object + indicative scene clause.

Hearing: sound source, content, and event

سمع may take the sound or speaker as its object, then an event clause describing what was heard:

سمعت الجرس يرن في الطابق السفلي

samiʿtu l-jarasa yarinnu fī ṭ-ṭābiqi s-sufliyy

I heard the bell ringing downstairs.

سمعنا المتحدث يقول إن الجلسة ستبدأ بعد قليل

samiʿnā l-mutaḥadditha yaqūlu ʾinna l-jalsata satabdaʾu baʿda qalīl

We heard the speaker say that the session would begin shortly.

This sentence has nested layers: المتحدثَ is the object of سمعنا; indicative يقولُ describes the heard event; إنّ الجلسةَ... is the reported proposition. Treating every layer as one English that-clause hides the Arabic structure.

For information learned by report rather than sound directly perceived, سمعت أنّ... is possible and means “I heard/learned that...”:

سمعت أن المكتبة ستغلق مبكرا اليوم

samiʿtu ʾanna l-maktabata satughliqu mubakkiran l-yawm

I heard that the library will close early today.

The contrast is evidential: سمعت الجرس يرن reports acoustic perception; سمعت أنّ... reports acquired information without claiming direct access to the event itself.

Cognition and discovery: أنّ propositions

Verbs such as علم “know/learn,” أدرك “realize,” اكتشف “discover,” and لاحظ “notice” readily select a proposition with heavy أنّ. Inside it, the noun of أنّ is accusative and its predicate has its normal form.

أدرك الفريق أن الموعد أقرب مما توقع

ʾadraka l-farīqu ʾanna l-mawʿida ʾaqrabu mimmā tawaqqaʿ

The team realized that the deadline was sooner than expected.

اكتشف الباحثون أن العينة تحتوي على نسبة أعلى من الحديد

iktashafa l-bāḥithūna ʾanna l-ʿayyinata taḥtawī ʿalā nisbatin ʾaʿlā mina l-ḥadīd

The researchers discovered that the sample contains a higher proportion of iron. (Academic.)

Arabic keeps تحتوي in the imperfect because the composition remains true. A past cognition verb does not mechanically force its content into past time.

The proposition normally follows its selecting verb. For contrastive topicalization, formal prose often uses a resumptive frame instead of stranding a raw أنّ clause at the front:

أما أن الخطة تحتاج إلى تعديل، فقد أدركه الجميع منذ البداية

ʾammā ʾanna l-khuṭṭata taḥtāju ʾilā taʿdīlin, fa-qad ʾadrakahu l-jamīʿu mundhu l-bidāya(h)

As for the fact that the plan needs amendment, everyone realized it from the beginning. (Marked formal topicalization.)

The أما... فـ frame licenses the fronted topic, and resumptive ـه in أدركه points back to it. Ordinary prose prefers أدرك الجميع أنّ....

Belief and judgment: two objects or a proposition

In the meaning “consider/believe,” ظنّ and cognition رأى can take two accusatives corresponding to the subject and predicate of an underlying nominal sentence:

ظننت الطريق مفتوحا حتى المساء

ẓanantu ṭ-ṭarīqa maftūḥan ḥattā l-masāʾ

I thought the road was open until evening.

Underlying الطريق مفتوح becomes accusative الطريقَ مفتوحًا after ظننت. Heavy أنّ offers a full proposition instead and can sound more explicit:

كنت أظن أن الطريق مفتوح حتى المساء

kuntu ʾaẓunnu ʾanna ṭ-ṭarīqa maftūḥun ḥattā l-masāʾ

I had thought that the road was open until evening.

Notice the changed case: with أنّ, الطريقَ is its accusative noun but مفتوحٌ returns to nominative as its predicate. Memorize which cognition verbs allow the compact two-object pattern; do not extend it to every English verb of thinking.

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Case exposes the architecture: ظننت الطريقَ مفتوحًا has two accusatives governed by the cognition verb, whereas ظننت أنّ الطريقَ مفتوحٌ has accusative اسم أنّ and nominative خبر أنّ.

أنّ facts versus أنْ contemplated actions

The contrast can change the lexical sense of رأى. رأى أنّ... presents a judgment about a proposition; رأى أنْ + subjunctive commonly means “saw fit / decided to” perform an action.

رأى المجلس أن الاقتراح مناسب للمرحلة الحالية

raʾā l-majlisu ʾanna l-iqtirāḥa munāsibun lil-marḥalati l-ḥāliyya(h)

The council considered the proposal suitable for the current phase. (Formal.)

رأى المجلس أن يؤجل التصويت إلى الأسبوع المقبل

raʾā l-majlisu ʾan yuʾajjila t-taṣwīta ʾilā l-ʾusbūʿi l-muqbil

The council saw fit to postpone the vote until next week. (Formal.)

The second construction does not report visual perception. Light أنْ selects the contemplated event and governs subjunctive يؤجّلَ.

A formal analytical sentence

لاحظ المراجعون أن بعض الأرقام لا تتطابق مع الجداول المرفقة، ورأوا أن يطلبوا من الجهة المعنية توضيح الفروق قبل أن يعتمدوا النسخة النهائية

lāḥaẓa l-murājiʿūna ʾanna baʿḍa l-ʾarqāmi lā tataṭābaqu maʿa l-jadāwili l-murfaqati, wa-raʾaw ʾan yaṭlubū mina l-jihati l-maʿniyyati tawḍīḥa l-furūqi qabla ʾan yaʿtamidū n-nuskhata n-nihāʾiyya(h)

The reviewers noticed that some figures did not match the attached tables and decided to ask the relevant authority to explain the differences before they approved the final version. (Formal.)

Heavy أنّ packages an observed fact; light أنْ twice packages prospective actions and deletes the mood nūn in يطلبوا and يعتمدوا.

Common Mistakes

Making a witnessed scene subjunctive

❌ رأيت الطلاب يدخلوا المختبر

Incorrect — the finite scene after direct perception is indicative: يدخلون.

✅ رأيت الطلاب يدخلون المختبر واحدا بعد آخر

raʾaytu ṭ-ṭullāba yadkhulūna l-mukhtabara wāḥidan baʿda ʾākhar

I saw the students entering the laboratory one after another.

Leaving a circumstantial predicate nominative

❌ وجدت النافذة مفتوحة

wajadtu n-nāfidhata maftūḥatun

Incorrect reading — مفتوحة describes the object's state and is accusative: maftūḥatan.

✅ وجدت النافذة مفتوحة بعد العاصفة

wajadtu n-nāfidhata maftūḥatan baʿda l-ʿāṣifa(h)

I found the window open after the storm.

Merging أنْ and أنّ after رأى

❌ رأى أعضاء الفريق أن يؤجلون التجربة

Incorrect — the contemplated-action construction uses light أنْ and subjunctive يؤجلوا.

✅ رأى أعضاء الفريق أن يؤجلوا التجربة حتى تصل المعدات

raʾā ʾaʿḍāʾu l-farīqi ʾan yuʾajjilū t-tajribata ḥattā taṣila l-muʿaddāt

The team members saw fit to postpone the experiment until the equipment arrived.

Copying English tense backshift

❌ اكتشفنا أن النهر كان يصب في البحر الآن

Incorrect for a continuing geographic fact — الآن conflicts with the unnecessary past frame.

✅ تعلمنا أن هذا النهر يصب في البحر المتوسط

taʿallamnā ʾanna hādhā n-nahra yaṣubbu fī l-baḥri l-mutawassiṭ

We learned that this river flows into the Mediterranean.

Translating every cognition verb with the same frame

❌ استمعنا أن الخبر عاجل

Incorrect valency — استمع takes إلى for what one listens to; for acquired information use سمعنا أنّ.

✅ سمعنا أن الخبر عاجل، ففتحنا البث المباشر

samiʿnā ʾanna l-khabara ʿājilun, fa-fataḥnā l-baththa l-mubāshir

We heard that the news was urgent, so we opened the live stream.

Key Takeaways

Direct perception can take an object, object + accusative state, or object + indicative scene.
Cognition and discovery verbs commonly take an أنّ proposition.
ظنّ and judgment رأى may take two accusatives, but this pattern is verb-specific.
رأى أنّ... expresses a judgment; رأى أنْ + subjunctive can mean “see fit to do.”
Learn each verb together with its complement frame; English that is not a reliable valency guide.

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