Form IV verbs (أفعل)

Introducing Form IV Verbs

Form IV verbs are created by prefixing an Alif with a hamza (أ) to the basic three-letter root. They are frequently causative, meaning they describe causing an action to happen or bringing a state about.

Many common Form IV verbs related to media and communication are "defective" (الناقص), meaning their final root letter is weak. In the past tense, these verbs end in an Alif Maqsura (ى).

Conjugating Defective Form IV Verbs in the Past Tense

The base past tense pattern for Form IV is أفْعَلَ. When conjugating defective verbs ending in ى, the final letter shifts depending on the subject:

• He: The ى remains unchanged.
• She: The ى is dropped entirely.
• I / You / We: The ى changes into a regular ي before the pronoun suffix is added.
• They (dual): The ى also changes to a ي before the dual suffix.

Present Tense of Form IV

In the present tense, regular Form IV verbs follow the pattern يُفْعِلُ. Just like Forms II and III, there are two key vowel rules for the present tense:

• The prefix (ي، ت، أ، ن) takes a damma ( ُ ).
• The middle root letter takes a kasra ( ِ ).

For defective Form IV verbs, the final weak letter becomes a ي in the standard present tense.