Complete Conjugation of Khāfa–Yakhāfu: Hollow Wāw from the Samiʿa Class

1. The Khāfa–Yakhāfu Paradigm

The root of خَافَ يَخَافُ is خ و ف. Its second root consonant is wāw, making it a hollow wāw verb. Unlike قَالَ يَقُولُ, however, it belongs to the سَمِعَ يَسْمَعُ class.

Word / formMeaning / explanation
خَافَhe feared.
خِيفَsomeone/something was feared.
يَخَافُhe fears.
يُخَافُsomeone/something is feared.

Root identity must be distinguished from voice and tense: the same three consonants can produce visibly different active and passive forms.

2. Two Hollow-Wāw Classes Contrasted

Two verbs may both be hollow wāw yet belong to different classes. قَالَ يَقُولُ retains a long ū in the imperfect, whereas خَافَ يَخَافُ has a long ā in the imperfect.
قَالَ — قُلْتُ — يَقُولُ — لَمْ يَقُلْ
خَافَ — خِفْتُ — يَخَافُ — لَمْ يَخَفْ
The root's medial wāw does not have to appear as a written wāw in every inflected form. The verb class and the conditions of weak-letter alteration determine the actual output.

3. Perfect Active and Passive: Positions 1–7

The active perfect identifies the fearing subject; the passive perfect centres the one or thing feared. The first seven positions are as follows.

PronounActive perfectPassive perfect
هُوَخَافَخِيفَ
هُمَا (م)خَافَاخِيفَا
هُمْخَافُواخِيفُوا
هِيَخَافَتْخِيفَتْ
هُمَا (ف)خَافَتَاخِيفَتَا
هُنَّخِفْنَخُفْنَ
أَنْتَخِفْتَخُفْتَ

خَافَ / خِيفَ contrast overtly, but the feminine plural is خِفْنَ in the active and خُفْنَ in the passive. The initial vowel distinguishes voice even where both stems are contracted.

4. Perfect Active and Passive: Positions 8–14

The remaining positions include the second-person dual and plurals and the first-person forms. The long middle vowel is contracted before many consonantal endings.

PronounActive perfectPassive perfect
أَنْتُمَا (م)خِفْتُمَاخُفْتُمَا
أَنْتُمْخِفْتُمْخُفْتُمْ
أَنْتِخِفْتِخُفْتِ
أَنْتُمَا (ف)خِفْتُمَاخُفْتُمَا
أَنْتُنَّخِفْتُنَّخُفْتُنَّ
أَنَاخِفْتُخُفْتُ
نَحْنُخِفْنَاخُفْنَا

خِفْتُمْ ends in the masculine-plural second-person suffix, while خِفْنَا is first-person plural. Attached person markers are essential to meaning; the lexical root alone cannot supply person and number.

5. Why Khāfa Becomes Khiftu

In the underlying form of خَافَ, a mobile medial wāw after fatḥah becomes alif. Before consonantal endings, however, the long alif cannot remain, so it disappears and the first consonant takes kasrah.
خَوِفَ → خَافَ
خِفْتُ — I feared.
خِفْنَ — they (females) feared.
A fabricated `خَافْتُ` is not the actual conjugation. The correct contracted form is خِفْتُ.

6. The Passive Perfect Khīfa

خِيفَ is the passive perfect. Passive vocalisation changes the beginning to kasrah, and weak-letter development yields a medial ī sound. The active خَافَ (“he feared”) is therefore contrasted with the passive خِيفَ (“he/it was feared”).

Word / formMeaning / explanation
خَافَthird-person masculine singular, active.
خِيفَthird-person masculine singular, passive.
خِفْتُactive first person; خُفْتُ — passive first person, distinguished by the first vowel.

Voice cannot always be inferred from a single initial vowel without the rest of the form and its context.

7. Imperfect Active and Passive: Positions 1–7

The active imperfect is يَخَافُ; the passive is يُخَافُ. The imperfect prefixes have different vowels in the active and passive paradigms.

PronounActive imperfectPassive imperfect
هُوَيَخَافُيُخَافُ
هُمَا (م)يَخَافَانِيُخَافَانِ
هُمْيَخَافُونَيُخَافُونَ
هِيَتَخَافُتُخَافُ
هُمَا (ف)تَخَافَانِتُخَافَانِ
هُنَّيَخَفْنَيُخَفْنَ
أَنْتَتَخَافُتُخَافُ

The feminine-plural يَخَفْنَ contracts the medial long vowel before nūn al-niswah. Its corresponding passive is يُخَفْنَ.

8. Imperfect Active and Passive: Positions 8–14

In the second-person dual/plural and first-person positions, the lexical root remains stable while prefixes and attached endings change.

PronounActive imperfectPassive imperfect
أَنْتُمَا (م)تَخَافَانِتُخَافَانِ
أَنْتُمْتَخَافُونَتُخَافُونَ
أَنْتِتَخَافِينَتُخَافِينَ
أَنْتُمَا (ف)تَخَافَانِتُخَافَانِ
أَنْتُنَّتَخَفْنَتُخَفْنَ
أَنَاأَخَافُأُخَافُ
نَحْنُنَخَافُنُخَافُ

تَخَافِينَ contains the second-person feminine yāʾ and an inflectional nūn. أَخَافُ is first-person singular and نَخَافُ first-person plural.

9. Lan: Complete Subjunctive Paradigm

لَنْ negates the future and governs the subjunctive. The corresponding ending varies by person and number.

PronounLan + activeLan + passive
هُوَلَنْ يَخَافَلَنْ يُخَافَ
هُمَا (م)لَنْ يَخَافَالَنْ يُخَافَا
هُمْلَنْ يَخَافُوالَنْ يُخَافُوا
هِيَلَنْ تَخَافَلَنْ تُخَافَ
هُمَا (ف)لَنْ تَخَافَالَنْ تُخَافَا
هُنَّلَنْ يَخَفْنَلَنْ يُخَفْنَ
أَنْتَلَنْ تَخَافَلَنْ تُخَافَ
أَنْتُمَا (م)لَنْ تَخَافَالَنْ تُخَافَا
أَنْتُمْلَنْ تَخَافُوالَنْ تُخَافُوا
أَنْتِلَنْ تَخَافِيلَنْ تُخَافِي
أَنْتُمَا (ف)لَنْ تَخَافَالَنْ تُخَافَا
أَنْتُنَّلَنْ تَخَفْنَلَنْ تُخَفْنَ
أَنَالَنْ أَخَافَلَنْ أُخَافَ
نَحْنُلَنْ نَخَافَلَنْ نُخَافَ

لَنْ يَخَافَ — he will not fear.
لَنْ يُخَافَ — he/it will not be feared.
In the relevant dual and masculine-plural positions the inflectional nūn is removed; nūn al-niswah in the feminine plural remains.

10. Lam: Complete Jussive Paradigm

لَمْ makes an imperfect jussive while referring to a negated past event. Several singular hollow forms contract the long medial vowel.

PronounLam + activeLam + passive
هُوَلَمْ يَخَفْلَمْ يُخَفْ
هُمَا (م)لَمْ يَخَافَالَمْ يُخَافَا
هُمْلَمْ يَخَافُوالَمْ يُخَافُوا
هِيَلَمْ تَخَفْلَمْ تُخَفْ
هُمَا (ف)لَمْ تَخَافَالَمْ تُخَافَا
هُنَّلَمْ يَخَفْنَلَمْ يُخَفْنَ
أَنْتَلَمْ تَخَفْلَمْ تُخَفْ
أَنْتُمَا (م)لَمْ تَخَافَالَمْ تُخَافَا
أَنْتُمْلَمْ تَخَافُوالَمْ تُخَافُوا
أَنْتِلَمْ تَخَافِيلَمْ تُخَافِي
أَنْتُمَا (ف)لَمْ تَخَافَالَمْ تُخَافَا
أَنْتُنَّلَمْ تَخَفْنَلَمْ تُخَفْنَ
أَنَالَمْ أَخَفْلَمْ أُخَفْ
نَحْنُلَمْ نَخَفْلَمْ نُخَفْ

لَمْ يَخَفْ — he did not fear.
لَمْ يُخَفْ — he/it was not feared.
Dual لَمْ يَخَافَا and masculine plural لَمْ يَخَافُوا retain the long ā but drop inflectional nūn. Not all jussive positions have the same surface contraction.

11. Inflectional Nūn Versus Nūn al-Niswah

The final nūn of يَخَافَانِ and يَخَافُونَ is inflectional nūn; it disappears in subjunctive or jussive forms. In يَخَفْنَ, however, the nūn is the feminine-plural pronoun.
يَخَافُونَ → لَمْ يَخَافُوا
تَخَافِينَ → لَنْ تَخَافِي
يَخَفْنَ → لَمْ يَخَفْنَ
The final nūn remains in the last example because it is nūn al-niswah, not inflectional nūn.

12. Heavy Emphatic Nūn: Active Paradigm

Prepending an emphatic lām and using the heavy nūn adds force to the active imperfect. The heavy nūn carries doubling (shaddah).

PronounActive with heavy nūn
هُوَلَيَخَافَنَّ
هُمَا (م)لَيَخَافَانِّ
هُمْلَيَخَافُنَّ
هِيَلَتَخَافَنَّ
هُمَا (ف)لَتَخَافَانِّ
هُنَّلَيَخَفْنَانِّ
أَنْتَلَتَخَافَنَّ
أَنْتُمَا (م)لَتَخَافَانِّ
أَنْتُمْلَتَخَافُنَّ
أَنْتِلَتَخَافِنَّ
أَنْتُمَا (ف)لَتَخَافَانِّ
أَنْتُنَّلَتَخَفْنَانِّ
أَنَالَأَخَافَنَّ
نَحْنُلَنَخَافَنَّ

لَيَخَافَنَّ expresses strong emphasis, approximately “he will certainly fear,” rather than a plain present statement. Dual, plural and feminine-plural endings require distinct inflectional forms.

13. Heavy Emphatic Nūn: Passive Paradigm

The heavy nūn does not turn a passive verb into an active one. It emphasises the passive proposition: someone or something will indeed be feared.

PronounPassive with heavy nūn
هُوَلَيُخَافَنَّ
هُمَا (م)لَيُخَافَانِّ
هُمْلَيُخَافُنَّ
هِيَلَتُخَافَنَّ
هُمَا (ف)لَتُخَافَانِّ
هُنَّلَيُخَفْنَانِّ
أَنْتَلَتُخَافَنَّ
أَنْتُمَا (م)لَتُخَافَانِّ
أَنْتُمْلَتُخَافُنَّ
أَنْتِلَتُخَافِنَّ
أَنْتُمَا (ف)لَتُخَافَانِّ
أَنْتُنَّلَتُخَفْنَانِّ
أَنَالَأُخَافَنَّ
نَحْنُلَنُخَافَنَّ

لَيُخَافَنَّ — someone/something will certainly be feared.
By contrast, لَيَخَافَنَّ means “he will certainly fear.” The prefix vowel distinguishes voice, while the doubled nūn conveys emphasis in both.

14. Light Emphatic Nūn and Unused Positions

The light emphatic nūn is non-doubled and quiescent. The textbook does not populate all fourteen positions: dual and feminine-plural positions are left blank where the light-nūn paradigm is not used.

PronounLight nūn activeLight nūn passive
هُوَلَيَخَافَنْلَيُخَافَنْ
هُمَا (م)——
هُمْلَيَخَافُنْلَيُخَافُنْ
هِيَلَتَخَافَنْلَتُخَافَنْ
هُمَا (ف)——
هُنَّ——
أَنْتَلَتَخَافَنْلَتُخَافَنْ
أَنْتُمَا (م)——
أَنْتُمْلَتَخَافُنْلَتُخَافُنْ
أَنْتِلَتَخَافِنْلَتُخَافِنْ
أَنْتُمَا (ف)——
أَنْتُنَّ——
أَنَالَأَخَافَنْلَأُخَافَنْ
نَحْنُلَنَخَافَنْلَنُخَافَنْ

لَيَخَافَنْ has light nūn; لَيَخَافَنَّ has heavy nūn. A dash denotes an unused position in the source table, not a gap to be supplied with an invented form.

15. How Emphasis Affects Person Endings

Adding نَّ mechanically to every imperfect is insufficient. Dual forms require a special arrangement, and feminine-plural forms include a separating alif after nūn al-niswah before the emphatic ending.
Masculine singular third person: لَيَخَافَنَّ
Masculine dual third person: لَيَخَافَانِّ
Feminine plural third person: لَيَخَفْنَانِّ
These forms preserve the person/number markers while applying emphasis; the resulting endings are not identical across all fourteen positions.

16. Active and Passive Commands: All Positions

The imperative expresses a request or command. Direct second-person active commands use distinctive forms; third-person, first-person and passive commands employ lām al-amr with a jussive imperfect.

PronounActive commandPassive command
هُوَلِيَخَفْلِيُخَفْ
هُمَا (م)لِيَخَافَالِيُخَافَا
هُمْلِيَخَافُوالِيُخَافُوا
هِيَلِتَخَفْلِتُخَفْ
هُمَا (ف)لِتَخَافَالِتُخَافَا
هُنَّلِيَخَفْنَلِيُخَفْنَ
أَنْتَخَفْلِتُخَفْ
أَنْتُمَا (م)خَافَالِتُخَافَا
أَنْتُمْخَافُوالِتُخَافُوا
أَنْتِخَافِيلِتُخَافِي
أَنْتُمَا (ف)خَافَالِتُخَافَا
أَنْتُنَّخَفْنَلِتُخَفْنَ
أَنَالِأَخَفْلِأُخَفْ
نَحْنُلِنَخَفْلِنُخَفْ

Word / formMeaning / explanation
خَفْfear (addressing one male).
لِيَخَفْlet him fear.
لِيُخَفْlet him/it be feared.

Direct address, third-person command and passive voice must be distinguished.

17. Why the Imperative Can Be Khaf or Khāfū

خَفْ is the direct masculine singular imperative. It is derived from تَخَافُ with the imperfect prefix removed and jussive contraction of the long medial vowel. In the masculine plural خَافُوا, long ā is retained before the plural wāw.

TypeArabic formMeaning
Masculine singularخَفْfear!
Masculine dualخَافَاyou two, fear!
Masculine pluralخَافُواyou all, fear!
Feminine singularخَافِيyou (female), fear!

The stem changes with number and endings; it is not simply the singular imperative repeated for each position.

18. Active and Passive Prohibitions: All Positions

Prohibitive lā makes the imperfect jussive and expresses an instruction not to do something. This differs from a plain negative statement.

PronounActive prohibitionPassive prohibition
هُوَلَا يَخَفْلَا يُخَفْ
هُمَا (م)لَا يَخَافَالَا يُخَافَا
هُمْلَا يَخَافُوالَا يُخَافُوا
هِيَلَا تَخَفْلَا تُخَفْ
هُمَا (ف)لَا تَخَافَالَا تُخَافَا
هُنَّلَا يَخَفْنَلَا يُخَفْنَ
أَنْتَلَا تَخَفْلَا تُخَفْ
أَنْتُمَا (م)لَا تَخَافَالَا تُخَافَا
أَنْتُمْلَا تَخَافُوالَا تُخَافُوا
أَنْتِلَا تَخَافِيلَا تُخَافِي
أَنْتُمَا (ف)لَا تَخَافَالَا تُخَافَا
أَنْتُنَّلَا تَخَفْنَلَا تُخَفْنَ
أَنَالَا أَخَفْلَا أُخَفْ
نَحْنُلَا نَخَفْلَا نُخَفْ

Word / formMeaning / explanation
لَا تَخَفْdo not fear (masculine singular).
لَا يُخَفْlet him/it not be feared.
لَا تَخَافُواdo not fear (masculine plural).

Loss of inflectional nūn in dual/plural and contraction in singular jussive forms distinguish these paradigms from the ordinary indicative.

19. Negating Lā versus Prohibitive Lā

Two functions of lā must be distinguished through meaning and inflection.

Word / formMeaning / explanation
لَا يَخَافُhe does not fear; ordinary negation with indicative imperfect.
لَا تَخَفْdo not fear; prohibition with jussive imperfect.
لَا يُخَافُhe/it is not feared; ordinary passive negation.
لَا يُخَفْlet him/it not be feared; passive prohibition.

The key is whether lā merely denies a proposition or instructs against an action, and the corresponding verbal inflection.

20. Emphasis in Commands and Prohibitions

Commands and prohibitions can acquire additional emphasis through heavy or light nūn. This strengthens the directive or prohibition without changing the root.

Word / formMeaning / explanation
خَفْfear!
لَتَخَافَنَّyou will certainly fear (emphatic assertion).
لَا تَخَافَنَّdo not fear at all (emphatic prohibition).
لَا تَخَافَنْa light-nūn emphatic prohibition.

Distinguishing the emphatic nūn from the role of lām or lā prevents confusion between an emphatic statement and an emphatic prohibition.

21. Participles: Six Active and Six Passive Forms

خَائِفٌ is the active participle, “one who fears”; مَخُوفٌ is the passive participle, “one/that which is feared.” Each has six principal masculine and feminine number/gender forms.

PositionActive participlePassive participle
Masc. singularخَائِفٌمَخُوفٌ
Masc. dualخَائِفَانِمَخُوفَانِ
Masc. pluralخَائِفُونَمَخُوفُونَ
Fem. singularخَائِفَةٌمَخُوفَةٌ
Fem. dualخَائِفَتَانِمَخُوفَتَانِ
Fem. pluralخَائِفَاتٌمَخُوفَاتٌ

These are semantically distinct: the fearer must not be confused with the object of fear.

22. Why Khāʾif Contains Hamzah

The usual active-participle pattern is فَاعِلٌ. When the root خ و ف enters this pattern, the medial weak consonant is replaced by hamzah in this environment, yielding خَائِفٌ.
خ و ف → فَاعِلٌ pattern → خَائِفٌ
خَائِفَةٌ is feminine; خَائِفُونَ and خَائِفَاتٌ are masculine and feminine plurals.
The hamzah is not a fourth original root consonant. It is a derived replacement for the medial wāw; the root is not خ ا ف.

23. Why the Wāw Remains in Makhūf

مَخُوفٌ is the passive participle. It follows the مَفْعُولٌ formation; its weak-letter development does not produce the hamzah seen in خَائِفٌ.
خ و ف → مَفْعُولٌ pattern → مَخُوفٌ
خَائِفٌ — someone who fears.
مَخُوفٌ — someone or something feared.
One lexical root may therefore yield distinct active and passive participial shapes under different morphological patterns.

24. Four Core Derivational Explanations

The chapter explains how medial wāw can become alif, appear through a ī-like passive outcome, disappear under contraction, or remain in a different pattern.

Underlying form/rootSurface formMain reason
خَوِفَخَافَWeak-letter substitution to alif
Passive basisخِيفَPassive vocalisation and weak-letter change
يَخَافُلَمْ يَخَفْJussive contraction
خ و ف + fāʿilخَائِفٌHamzah substitution in active participle

A proper derivational explanation identifies the starting form, governing rule and outcome; naming the final form alone is insufficient.

25. Integrated Review of the Complete Chapter

The root خ و ف and the سَمِعَ يَسْمَعُ class tie the entire chapter together.

CategoryFormMeaning
Active perfectخَافَHe feared
Passive perfectخِيفَHe/it was feared
Active imperfectيَخَافُHe fears
Passive imperfectيُخَافُHe/it is feared
Lamلَمْ يَخَفْHe did not fear
Lanلَنْ يَخَافَHe will not fear
Direct commandخَفْFear!
Prohibitionلَا تَخَفْDo not fear!
Active participleخَائِفٌOne who fears
Passive participleمَخُوفٌOne who is feared

Inflectional person, voice and governing particles distinguish these meanings without changing the underlying root.