The Doubled Verb (الفعلُ المُضعَف)

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Words which have two repeated or doubled letters in its root (base).

We will divide the doubled verb into two categories as the rules for each differ.

Doubled verbs
Triliteral verbsQuadrilateral verbs

Triliteral verbs are verbs with three radicals or letters in its root. Whereas quadrilateral verbs have four radicals.

Trilileral Doubled Verbs

These are three letter verbs where the 2nd and 3rd letters are the same. For example: شَدَّ، رَدَّ.

شُدّ/ أُشْدُدْيَشُدُّشَدَّ
  • Here the verb looks like it has only two letters in its stem. But actually there are three letters as the second letter of the verb has a Shaddah ّ on it which represents the letter repeating twice. رَدَّ = رَدَدَ.
  • When using the verb in the past tense, the duplicated letters can be unfolded in the case of  ( تاء الفاعل – نا الفاعلين – نون النسوة). Eg.: رَدَدْتُ / رَدَدْتَ / رَدَدْتِ / رَدَدْتُمَا / رَدَدْنَا / رَدَدْنَ.
  • When using the verb in present tenses, the duplicated letters can be unfolded when assigned to  نون النسوة. Eg.: يَرْدُدْنَ / تَرْدُدْنَ
  • When using the verb in the imperative tense, the duplicated letters can be unfolded when assigned to (نون النسوة and we should add Hamza  to the beginning of the verb as in ردَّ : أَردُدنَ.

Quadriliteral Doubled Verbs

These are verbs with four radicals in their root. The first and third radicals are the same also the second and fourth radicals are the same too . Eg.: زَلْزَلَ

These verbs follow normal conjugation.


In this case, the verbs are conjugated normally.

past tense
Plural Dual Singular
Third Person رَدّواthey replied رَدّاthey replied رَدَّhe replied M
رَدَدْنَthey replied رَدَّتاthey replied رَدَّتْshe replied F
Second Person رَدَدْتُمْyou replied رَدَدْتُماyou replied رَدَدْتَyou replied M
رَدَدْتُنَّyou replied رَدَدْتُماyou replied رَدَدْتِyou replied F
First Person رَدَدْناwe replied رَدَدْتُI replied M & F
present tense
Plural Dual Singular
Third Person يَرُدّونَthey replied يَرُدّانِthey reply يَرُدُّhe replies M
يَرْدُدْنَthey replied تَرُدّانِthey replied تَرُدُّshe replies F
Second Person تَرُدُّونَyou replied تَرُدّانِyou replied تَرُدُّyou replied M
تَرْدُدْنَyou replied تَرُدّانِyou replied تَرُدّينَyou replied F
First Person نَرُدُّyou replied أَرُدُّyou replied M & F
imperative(command) tense
Plural Dual Singular ..
Third Person .. .. .. M
.. .. .. F
Second Person رُدّواreply رُدّاreply رُدَّ \ أُرْدُدْreply M
أُرْدُدْنَreply رُدّاreply رُدّيreply F
First Person .. .. .. M & F

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