Imperatives of Weak Verbs

A weak imperative is not made by cutting the ending off the perfect. It comes from the second-person jussive imperfect: put the verified imperfect in the jussive, remove its person prefix تـ, and add a helping hamzat al-waṣl only if the result begins with an unpronounceable cluster. This method produces very different-looking commands such as عِدْ “promise,” قُلْ “say,” اُدْعُ “invite,” اِرْمِ “throw,” and اِسْعَ “strive.”

The differences are systematic once the correct jussive is known. Initial-weak verbs may already have lost their first radical, hollow verbs shorten their middle vowel, and final-weak verbs lose their last radical in the masculine-singular jussive. Agreement suffixes can then restore or reshape vowels and weak letters. Review the general imperative derivation procedure before comparing all five imperative endings.

The derivation starts with the jussive

Compare one representative of each weak class. All are Form I, but their verified imperfect stems behave differently.

عِدْ and قُلْ need no initial alif because their first surviving consonant already has a vowel. اُدْعُ، اِرْمِ، اِسْعَ do need hamzat al-waṣl because prefix removal exposes an initial cluster. The helping vowel is u in اُدْعُ but i in اِرْمِ، اِسْعَ; this is inherited from the verified Form-I stem, not chosen from the English meaning.

The kasra heard in قُلِ الحقيقة is a temporary linking vowel that prevents three consonants from colliding in connected speech. The command remains morphologically قُلْ. It is not a new ending and disappears before an easier boundary.

Initial-weak verbs: the first radical may already be absent

Form I وَعَدَ — يَعِدُ — وَعْدًا “promise,” root و-ع-د, loses first-radical و in the active imperfect. The imperative عِدْ therefore does not delete wāw as a special command rule; it inherits a jussive stem in which wāw is already absent. The same logic gives صِلْ “arrive; connect!” from وَصَلَ — يَصِلُ.

The long ī in feminine singular صِلِي is the addressee ending, not the returned root wāw. That distinction matters when parsing the form.

Hollow verbs: the jussive has already shortened the vowel

Hollow قَالَ — يَقُولُ — قَوْلًا has second-person jussive تَقُلْ, so its command is قُلْ. بَاعَ — يَبِيعُ — بَيْعًا gives بِعْ “sell!” and سَارَ — يَسِيرُ — سَيْرًا gives سِرْ “go; proceed!” The long vowel returns before several vowel-initial addressee endings: قُولِي، قُولَا، قُولُوا, but feminine plural is قُلْنَ before consonantal نَ.

Final-weak verbs: suffixes reshape the command

Masculine-singular اُدْعُ، اِرْمِ، اِسْعَ use the shortened jussive stem. Other addressees add endings, and those endings reveal different weak-letter outcomes. The five standard MSA addressee forms must be learned as a paradigm; dialects often reduce these contrasts (regional), but formal MSA retains them.

Unvocalized ادعوا can represent dual udʿuwā or masculine-plural udʿū; context and the addressee decide. Likewise, do not mistake the yāʾ of feminine ارمي for the root yāʾ simply “returning”: the ending and the weak stem interact as a whole.

Doubly weak verbs and one-letter commands

Form I وَقَى — يَقِي — وِقَايَةً “protect,” root و-ق-ي, is weak at both edges. Its second-person jussive is تَقِ; removing تـ leaves the fully valid one-letter imperative قِ qi. This form is standard but strongly (formal/literary) and normally appears with a complement, such as قِ نفسك من.... In everyday instructional prose, اِحْمِ نفسك “protect yourself” is often stylistically plainer. Religious formulae may instead use Form VIII اِتَّقِ “be mindful of; fear,” which is a different verb and meaning.

Other one-letter commands exist in the classical and literary lexicon, but they are not a productive license to shorten any weak verb. Learn each from verified principal parts and label its register. In particular, a one-letter spelling without context can be hard to recognize in unvocalized text.

Common Mistakes

Adding hamzat al-waṣl where the stem already begins with a vowel

Restoring an initial wāw that the imperfect has lost

Keeping a deleted final weak letter in the masculine singular

Using the masculine singular for a woman

Treating one-letter commands as an unrestricted shortcut

Key Takeaways

• Derive every imperative from the verified second-person jussive, not from the perfect.
• Initial-weak عِدْ and hollow قُلْ need no helping alif; clustered اُدْعُ، اِرْمِ، اِسْعَ do.
• Addressee suffixes can restore long vowels or reshape the final weak segment, so learn all five standard forms.
• One-letter قِ is a real command of وقى / يقي, but it is formal/literary and lexically restricted.
• Register, complement frame, and addressee agreement remain part of choosing a natural command.