Defective Wāw Verb: Full Paradigm of دَعَا يَدْعُو with Morphological Explanations

1. The Wāw-Final Verb: Structure and Scope

A wāw-final defective verb has wāw as its third root consonant. The root here is د ع و:
دَعَا — يَدْعُو — دَعْوَةٌ
Translation: He called — he calls — calling or inviting.
The final wāw of the root appears as alif in the third-person perfect but remains visible in the imperfect. A changed written form does not mean a changed underlying root. The source presents full active/passive paradigms, negatives, emphasis, commands, prohibitions and participles.

2. The Active Perfect and Its Root

دَعَوَ → دَعَا
Translation: He called.
The expected base contains final wāw after a fatḥah; it becomes alif in دَعَا. With personal endings, the root wāw becomes visible in certain forms:
دَعَوَا — the two men called.
دَعَوْا — the men called.
دَعَوْتُ — I called.
These forms show why the alif of the singular perfect is not a third root consonant in its own right.

3. Active Perfect: All Fourteen Forms

The active perfect is a fourteen-position paradigm. Observe where final wāw becomes alif and where it reappears with an attached ending.

PronounActive perfect
هودَعَا
هما (مذکر)دَعَوَا
همدَعَوْا
هيدَعَتْ
هما (مؤنث)دَعَتَا
هندَعَوْنَ
أنتَدَعَوْتَ
أنتما (مذکر)دَعَوْتُمَا
أنتمدَعَوْتُمْ
أنتِدَعَوْتِ
أنتما (مؤنث)دَعَوْتُمَا
أنتندَعَوْتُنَّ
أنادَعَوْتُ
نحندَعَوْنَا

Key contrast: دَعَا، دَعَوَا، دَعَوْا are not interchangeable; each identifies a different person/number combination. دَعَوْتُ reveals the root consonant with the first-person ending.

4. Passive Perfect: Formation

دُعِوَ → دُعِيَ
Translation: He was called.
In the passive, the action is described without naming its agent. The kasrah before the final weak letter leads to yāʾ replacing the underlying wāw. The resulting perfect is دُعِيَ, not دَعَا.
دَعَوْتُ — I called.
دُعِيتُ — I was called.
The vowel pattern as well as the final weak letter distinguishes active and passive.

5. Passive Perfect: All Fourteen Forms

The passive perfect displays the weak-final stem together with the fourteen personal endings.

PronounPassive perfect
هودُعِيَ
هما (مذکر)دُعِيَا
همدُعُوا
هيدُعِيَتْ
هما (مؤنث)دُعِيَتَا
هندُعِينَ
أنتَدُعِيتَ
أنتما (مذکر)دُعِيتُمَا
أنتمدُعِيتُمْ
أنتِدُعِيتِ
أنتما (مؤنث)دُعِيتُمَا
أنتندُعِيتُنَّ
أنادُعِيتُ
نحندُعِينَا

Compare: دُعِيَ is masculine singular, دُعُوا masculine plural and دُعِيتُ first-person singular. All describe the person called rather than the person who called.

6. Active Imperfect: Wāw in the Stem

يَدْعُو
Translation: He calls / will call.
The root wāw is visible in the imperfect stem. Attached dual or plural endings alter the form:
يَدْعُوَانِ — the two men call.
يَدْعُونَ — the men call.
تَدْعِينَ — you (feminine singular) call.
Identify the stem first and the person/number ending second. Some forms of weak-final verbs require full vocalization and context to distinguish otherwise similar written words.

7. Active Imperfect: Complete Paradigm

PronounActive imperfect
هويَدْعُو
هما (مذکر)يَدْعُوَانِ
هميَدْعُونَ
هيتَدْعُو
هما (مؤنث)تَدْعُوَانِ
هنيَدْعُونَ
أنتَتَدْعُو
أنتما (مذکر)تَدْعُوَانِ
أنتمتَدْعُونَ
أنتِتَدْعِينَ
أنتما (مؤنث)تَدْعُوَانِ
أنتنتَدْعُونَ
أناأَدْعُو
نحننَدْعُو

Reading the table: أَدْعُو marks first-person singular; نَدْعُو first-person plural. The ending in تَدْعِينَ is feminine singular second person, whereas تَدْعُونَ is masculine plural second person (and has a context-dependent similarly written feminine form).

8. Passive Imperfect: يُدْعَى

يُدْعَى
Translation: He is called / will be called.
The passive imperfect differs from active يَدْعُو in the prefix vowel, stem vowels and final weak-letter realization. Its written ending is alif maqṣūrah.
يَدْعُو — يُدْعَى
Translation: He calls — he is called.
Passive voice is an inflectional change in Arabic, not merely an English or Urdu translation convention.

9. Passive Imperfect: Fourteen Forms

PronounPassive imperfect
هويُدْعَى
هما (مذکر)يُدْعَيَانِ
هميُدْعَوْنَ
هيتُدْعَى
هما (مؤنث)تُدْعَيَانِ
هنيُدْعَيْنَ
أنتَتُدْعَى
أنتما (مذکر)تُدْعَيَانِ
أنتمتُدْعَوْنَ
أنتِتُدْعَيْنَ
أنتما (مؤنث)تُدْعَيَانِ
أنتنتُدْعَيْنَ
أناأُدْعَى
نحننُدْعَى

Forms to contrast: يُدْعَى singular, يُدْعَيَانِ dual and يُدْعَوْنَ masculine plural. تُدْعَيْنَ is second-person feminine singular. Person and number vary, while the passive sense “be called” remains.

10. The Particle لَنْ: Negation and Subjunctive

لَنْ negates a future action and governs the subjunctive. Weak-final verbs exhibit its effect through different endings:
لَنْ يَدْعُوَ — he will not call.
لَنْ يَدْعُوَا — the two will not call.
لَنْ يَدْعُوا — the men will not call.
لَنْ تَدْعِي — you (feminine singular) will not call.
On singular يَدْعُو, a final fatḥah is visible. In the five-verb forms the final nūn is omitted instead. These are different surface realizations of the same grammatical governance.

11. The Particle لَمْ: Jussive and Weak-Letter Deletion

يَدْعُو → لَمْ يَدْعُ
Translation: He calls → he did not call.
لَمْ governs the jussive and negates past occurrence. The final root wāw drops in the singular لَمْ يَدْعُ, leaving a ḍammah before the deleted consonant.
لَمْ يَدْعُوَا — the two did not call.
لَمْ يَدْعُوا — the men did not call.
In these dual/plural cases it is the indicative nūn ending that drops. Do not confuse this with final-root deletion in the singular.

12. لَمْ with All Active Forms

PronounActive imperfect with لَمْ
هولَمْ يَدْعُ
هما (مذکر)لَمْ يَدْعُوَا
هملَمْ يَدْعُوا
هيلَمْ تَدْعُ
هما (مؤنث)لَمْ تَدْعُوَا
هنلَمْ يَدْعُونَ
أنتَلَمْ تَدْعُ
أنتما (مذکر)لَمْ تَدْعُوَا
أنتملَمْ تَدْعُوا
أنتِلَمْ تَدْعِي
أنتما (مؤنث)لَمْ تَدْعُوَا
أنتنلَمْ تَدْعُونَ
أنالَمْ أَدْعُ
نحنلَمْ نَدْعُ

Three behaviors: لَمْ يَدْعُ loses final root wāw; dual لَمْ يَدْعُوَا loses indicative nūn; a feminine-plural form such as لَمْ يَدْعُونَ retains its feminine plural ending in this construction.

13. لَمْ with Passive Forms

PronounActive with لَمْPassive with لَمْ
هولَمْ يَدْعُلَمْ يُدْعَ
هما (مذکر)لَمْ يَدْعُوَالَمْ يُدْعَيَا
هملَمْ يَدْعُوالَمْ يُدْعَوْا
هيلَمْ تَدْعُلَمْ تُدْعَ
أنتَلَمْ تَدْعُلَمْ تُدْعَ
أنتِلَمْ تَدْعِيلَمْ تُدْعَيْ
أنالَمْ أَدْعُلَمْ أُدْعَ
نحنلَمْ نَدْعُلَمْ نُدْعَ

لَمْ يُدْعَ means “he was not called”: the final weak letter of passive يُدْعَى is removed in the jussive. لَمْ يَدْعُ instead denies that he called. Both show a jussive transformation but differ in voice.

14. Heavy and Light Emphatic Nūn

The source contrasts heavy emphatic nūn (doubled nūn) with light emphatic nūn (sukūn-bearing nūn). Both strengthen the assertion but take different endings:
لَيَدْعُوَنَّ — he will certainly call (heavy).
لَيَدْعُوَنْ — he will certainly call (light).
لَيَدْعُوَانِّ — emphatic dual masculine third person.
Person/number endings interact with the weak-final stem; one cannot simply append the same characters to every imperfect. The source marks some light-nūn cells with dashes rather than supplying active forms.

15. The Active Imperative

The direct second-person command is formed from the jussive second-person imperfect, removing the imperfect prefix and adding the proper connecting hamzah:

AddresseeActive command
أنتَاُدْعُ
أنتما (m.)اُدْعُوَا
أنتماُدْعُوا
أنتِاُدْعِي
أنتما (f.)اُدْعُوَا
أنتناُدْعُونَ

اُدْعُ — Call!
اُدْعِي — Call! (one woman)
اُدْعُوا — Call! (men, plural)
The final root wāw disappears in the masculine singular; attached endings account for the other command forms.

16. Third-Person and Passive Commands

The book's imperative paradigms include more than second-person commands. They also contain third-person and passive requests, typically formed with command-lām:

TypeFormSense
Third-person activeلِيَدْعُLet him call
Third-person passiveلِيُدْعَLet him be called
Second-person activeاُدْعُCall!
Second-person passiveلِتُدْعَLet you be called
First-person activeلِأَدْعُLet me call

لِيَدْعُ directs an action; لِيُدْعَ requests that a recipient be called. Both employ jussive formation.

17. Emphatic Commands and Person Endings

Emphatic commands should be distinguished from their plain jussive/imperative forms:
اُدْعُ — Call!
اُدْعُوَنَّ — Do certainly call!
لِيَدْعُ — Let him call.
لَيَدْعُوَنَّ — Let him certainly call.
The weak stem and emphatic ending interact. Use the source's particular person/number row and the heavy/light column; a uniform ending is not correct across the whole paradigm.

18. Prohibition: لَا and the Jussive

Prohibitive لَا governs the jussive of the imperfect and forbids an action:
لَا تَدْعُ — Do not call (m.s.).
لَا تَدْعُوَا — Do not call (dual).
لَا تَدْعُوا — Do not call (m.pl.).
لَا تَدْعِي — Do not call (f.s.).

AddresseeActive prohibition
أنتَلَا تَدْعُ
أنتمالَا تَدْعُوَا
أنتملَا تَدْعُوا
أنتِلَا تَدْعِي
أنتنلَا تَدْعُونَ

The masculine singular loses final root wāw as with jussive لَمْ تَدْعُ, but its speech function is prohibition rather than past negation.

19. Passive and Emphatic Prohibitions

Passive prohibition concerns something that must not be done to a person:
لَا تَدْعُ — Do not call.
لَا تُدْعَ — Do not be called / let you not be called.
لَا يَدْعُ — Let him not call.
لَا يُدْعَ — Let him not be called.
The source further provides heavy- and light-emphasis columns for both active and passive prohibition. Identify the prohibitive particle, the voice of the stem and the type of nūn separately. Dashes in the light-nūn columns should not be replaced with invented forms.

20. Active Participle: دَاعٍ

The expected active participle contains a weak final consonant. After the relevant changes, the indefinite masculine singular nominative/genitive is دَاعٍ, “caller / one who invites.”

FormActive participle
واحد مذکردَاعٍ
تثنیہ مذکردَاعِيَانِ
جمع مذکردَاعُونَ
واحد مؤنثدَاعِيَةٌ
تثنیہ مؤنثدَاعِيَتَانِ
جمع مؤنثدَاعِيَاتٌ

Important qualification: دَاعٍ is the indefinite masculine singular form in the nominative/genitive. In accusative or definite use, compare دَاعِيًا and الدَّاعِي. دَاعُونَ is masculine plural; دَاعِيَاتٌ feminine plural.

21. Passive Participle: مَدْعُوٌّ

مَدْعُوٌّ
Translation: One who is called / invited.
The underlying weak root contains wāw, and the passive-participle pattern contributes another wāw. The two combine through assimilation, yielding a doubled wāw in the written form.

FormPassive participle
واحد مذکرمَدْعُوٌّ
تثنیہ مذکرمَدْعُوَّانِ
جمع مذکرمَدْعُوُّونَ
واحد مؤنثمَدْعُوَّةٌ
تثنیہ مؤنثمَدْعُوَّتَانِ
جمع مؤنثمَدْعُوَّاتٌ

دَاعٍ denotes the caller; مَدْعُوٌّ the one called. The distinction is morphological as well as semantic.

22. Morphological Explanation of the Perfect

The book's explanations distinguish several changes in the active perfect:
دَعَوَ → دَعَا — final wāw becomes alif after fatḥah.
دَعَوَا — the dual suffix follows a retained root wāw.
دَعَوُوا → دَعَوْا — the masculine plural contracts a sequence of wāws.
دَعَوَتْ → دَعَتْ — after the weak-letter adjustment, two sukūns lead to deletion of the long vowel.
These are not one undifferentiated change: substitution and deletion have different triggers.

23. Morphological Explanation of the Passive and Participle

دُعِوَ → دُعِيَ
In the passive perfect the kasrah preceding underlying wāw licenses its change to yāʾ, also visible in دُعِيتُ.
مَدْعُوُوٌ → مَدْعُوٌّ
The root wāw meets the wāw of the passive-participle pattern; assimilation yields a doubled wāw.
Key distinction: دُعِيَ exemplifies weak-letter substitution; مَدْعُوٌّ shows assimilation. The morphological operations are not interchangeable.

24. Morphological Explanation of the Imperfect

يَدْعُو retains the root-final wāw. With endings, weak consonants and suffixes interact:
يَدْعُوُونَ → يَدْعُونَ — simplification of adjacent weak consonants in the masculine plural.
تَدْعُوِينَ → تَدْعِينَ — adjustment of root wāw with the feminine singular second-person ending.
يُدْعَوُ → يُدْعَى — the passive stem yields the written final alif maqṣūrah.
A single root therefore undergoes multiple distinct operations across its inflectional paradigm.

25. Jussive Deletion, Imperatives and Final Review

يَدْعُو → لَمْ يَدْعُ → اُدْعُ
The first is the indicative imperfect. With لَمْ, the jussive drops the final weak consonant. A direct command is then formed by removing the imperfect prefix and adding connecting hamzah.

CategoryFormMain reason
Active perfectدَعَاWāw → alif
Passive perfectدُعِيَWāw → yāʾ
Active imperfectيَدْعُوFinal wāw retained
Jussive imperfectلَمْ يَدْعُWeak-letter deletion
Second-person commandاُدْعُJussive + connecting hamzah
Active participleدَاعٍWeak final yāʾ rule
Passive participleمَدْعُوٌّAssimilation of wāws

All seven forms remain linked to the root د ع و. The changing surface forms reflect separate rules, not separate roots.