To talk about the passive voice in Arabic, we use the word مَجْهول (unknown). 

The passive form is used when the performer of the action is unknown, ignored, or unimportant. Two components are inherent to a passive tense in Arabic:

• The subject-like / نائِب الفاعِل
• The passive verb / الفِعْل المَجْهُول

The subject-like and the passive verb / نائب الفاعل والفِعْل المَجْهول

We know that the active form is used in Arabic when the performer of the action is the subject. In the passive form, because the subject isn’t mentioned, then the direct object takes the place of the subject and goes to the nominative case (مَرْفُوع). This is called the subject-like or نائب الفاعل (which literally means ‘the deputy of the doer’). It may be an explicit noun or a pronoun. We will then use a passive verb that agrees with it in person, gender, and number (same as the active verb with the subject).

Only internal vocalization differentiates a passive verb (فِعْل مَجْهُول) from an active verb (فِعْل مَعْلوم): the context generally makes it possible to make the difference, otherwise, one notes a distinctive vowel. Passive form verbs generally have the ḍamma on the first radical and the kasra on the second for all forms. They are generally built on pattern فُعِلَ in the perfect tense (الماضي) and يُفْعَلُ in the imperfect tense (المُضارِِع المَرْفوع):

Active (مَعْلُوم)	Passive (مَجْهُول)
يَقْرَأُ الطالِبُ الكِتَابَ The student reads the book	يُقْرَأُ الكِتَابُ  The book is read
أَصْلَحَ السَبّاكُ آلةَ الغَسْلِ The plumber fixed the washing machine	أُصْلِحَ آلةُ الغَسْلِ  The washing machine has been fixed
أَكَلَتْ الفَتاةُ التُفاحَ The girl ate the apples	أُكِلَ التُفاحُ The apples were eaten

Note: When a verb is constructed in the active form with two direct object complements, it can be converted to passive in two ways:

• The recipient of the action can become subject-like while the given object remains in the accusative case (مَنْصُوب). 
• Alternatively if desired, the given object can take on more of a subject role while the addressee will be preceded by the preposition لِ (but this is more a dialectal influence).

The woman was granted a son	وُهِبَتْ المَرْأَةُ وَلَدًا
A son was granted to the woman	وُهِبَ وَلَدٌ للمَرْأَةِ

The complement of agent

There is no complement of agent expressed in traditional Arabic, so if the performer of the action is mentioned, an active verb should be used instead. However, Modern Arabic is increasingly using compound prepositions to express the semantic agent in passive sentences, often due to European language influence, even though these are considered erroneous by purists. The most common compound prepositions used to express the passive agent are; مِن طَرَف / مِن قِبَلِ / مِن جانِبِ all meaning ‘by’.

مِن جانِبِ		مِن قِبَلِ	مِن طَرَف
from the side of, on behalf of = by

Examples:

The changes were made by the researchers	أُجْرِيَتْ التَغْيِيراتُ مِن جانِبِ الباحِثِينَ.
The request is taken by the staff	يُؤْخَذُ الطَلَبُ مِن قِبَلِ المُوَظَّفِينَ
The task has been requested by the director	طُلِبَتْ المُهِمّةُ مِن طَرَف المُدِيرِ

Passive verb conjugation

All verbs and forms I to X follow one vocal pattern when using the passive perfect tense. The first root vowel is ḍamma /u/ and the second root vowel is kasra /i/. This creates the masculine singular third-person form فُعِلَ. 

Similarly, the imperfect verb has a single pattern of vowelling for all verbs with the first radical being ḍamma and the middle radical holding the fatḥa /a/, resulting in the basic structure يُفْعَلُ.

Forms I to X

المَجْهُول Passive			المَعْلوم Active		الأَوْزان Forms
المُضارِع Imperfect (present)	الماضي  Perfect (past)		المُضارِع Imperfect (present)	الماضي Perfect (past)
يُفْعَلُ	فُعِلَ		يَفْعَلُ	فَعَلَ	I
يُفَعَّلُ	فُعِّلَ		يُفَعِّلُ	فَعَّلَ	II
يُفاعَلُ	فُوعِلَ		يُفاعِلُ	فاعَلَ	III
يُفْعَلُ	أُفْعِلَ		يُفْعِلُ	أَفْعَلَ	IV
يُتَفَعَّلُ	تُفُعِّلَ		يَتَفَعَّلُ	تَفَعَّلّ	V
يُتَفَاعَلُ	تُفُوعِلَ		يَتَفاعَلُ	تَفاعَلَ	VI
N/A	N/A		يَنْفَعِلُ	اِنْفَعَلَ	VII
يُفْتَعَلُ	اُفْتُعِلَ		يَفْتَعِلُ	اِفْتَعَلَ	VIII
N/A	N/A		يَفْعَلُّ	اِفْعَلَّ	IX
يُسْتَفْعَلُ	اُسْتُفْعِلَ		يَسْتَفْعِلُ	اِسْتَفْعَلَ	X

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Note: The derived verb forms VII and IX have no passive because they have an intransitive meaning or already express the passive (or at least the reflexive-passive), even if they are formally conjugated in the active form. This is also the case for some verbs in form V.

To break oneself	اِنْكَسَرَ	Form VII
To turn yellow	اِصْفَرَّ	Form IX
to be held/suspended	تَعَلَّقَ	Form V

Irregular verbs

المَجْهُول Passive			المَعْلوم Active		الأَفْعال غَيْر السالِمة Irregular verbs
المُضارِع Imperfect (present)	الماضي  Perfect (past)		المُضارِع Imperfect (present)	الماضي Perfect (past)
يُسَدُّ	سُدَّ		يَسُدُّ	سَدَّ	المُضاعَف Doubled roots
يُوصَلُ	وُصِلَ		يَصِلُ	وَصَلَ	المِثال Assimilated roots
يُقالُ	قِيلَ		يَقُولُ	قالَ	الأَجْوَف Hollow roots
يُعاشُ	عِيشَ		يَعِيشُ	عاشَ
يُنالُ	نِيلَ		يَنالُ	نالَ
يُدْعى	دُعِيَ		يَدْعو	دعا	الناقِص Defective roots
يُجْرى	جُرِيَ		يَجْرِي	جَرى

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Expression of passive with تَمّ

In addition to the passive form for verbs, another alternative way to convey a passive tense meaning which had become now predominant in Modern Standard Arabic is the use of verb تَمَّ in the perfect tense (الماضي) followed immediately by a verbal noun/maṣdar (مَصْدَر) in the nominal case (مَرْفُوع). The verb agrees in gender with the maṣdar.

تَمَّ + مَصْدر = المَجْهُول

The car has been repaired	تَمَّ إِصْلاحُ السَيّارةِ
The report has been written	تَمَّتْ كِتابةُ التَقْرِيرِ