In short

English strengthens a verb with an adverb: “I thanked him warmly”, “the news spread like wildfire”, “she knocked twice”. Arabic has a neater trick. It takes the verb’s own مَصْدَر - the verbal noun of lesson 54 - puts it in the accusative and lays it straight after the verb: شَكَرْتُهُ شُكْرًا. Literally “I thanked him a thanking”. That echo is called المَفْعولُ المُطْلَقُ, and once you can build it you can intensify, characterise or count any action in the language, because every verb has a مَصْدَر.

The lesson’s second half is a different accusative مَصْدَر. المَفْعولُ لِأَجْلِهِ gives the reason for the action: قُمْتُ اِحْتِرامًا لِلْأُسْتاذِ “I stood up out of respect for the teacher”. Both are مَصادِر, both are مَنْصوب, and one question each tells them apart: المُطْلَق answers “how / how many times?”, لِأَجْلِهِ answers “why?”. A bonus comes with them: شُكْرًا، عَفْوًا، أَهْلًا وَسَهْلًا، حَقًّا are all frozen absolute objects, so you have been using this construction since your first week.

The rule

1. What “absolute” means. Arabic’s other objects are named after a preposition - المَفْعولُ بِهِ (lesson 29), المَفْعولُ فيهِ (lesson 31), المَفْعولُ لِأَجْلِهِ below. This one hangs off the verb with no preposition at all, “absolutely”. It is a مَصْدَر of the same verb, always مَنْصوب, and changes nothing around it: كَتَبَ الطّالِبُ الرِّسالَةَ كِتابَةً keeps its subject and its ordinary object, with the مَصْدَر added on top.

The one hard requirement is that the مَصْدَر must come from that verb, in that form. عَلَّمَ is Form II, so its مَصْدَر is تَعْليمًا and nothing else; عِلْمًا belongs to عَلِمَ.

2. Job one: تَوْكيد, plain emphasis. The bare مَصْدَر doubles down on the verb: it happened, and it happened properly. English reaches for “really”, “indeed”, “warmly”, or a stressed verb.

• شَكَرْتُهُ شُكْرًا. - I thanked him sincerely.
• فَرِحَ الأَوْلادُ فَرَحًا. - The children were truly delighted.
• تَغَيَّرَتِ المَدينَةُ تَغَيُّرًا. - The city has genuinely changed.

In this job the مَصْدَر stands alone, indefinite: no plural, no الـ.

3. Job two: نَوْع, what kind of doing it was. This is the productive one. The مَصْدَر is no longer bare: it is either followed by an adjective or made the first term of an إِضافَة (lesson 20), and the description does the real work.

• نامَ الطِّفْلُ نَوْمًا عَميقًا. - The child slept deeply.
• تَصَرَّفَ تَصَرُّفًا حَكيمًا. - He acted wisely.
• اِنْتَشَرَ الخَبَرُ اِنْتِشارَ النّارِ في الهَشيمِ. - The news spread like fire in dry brush.
• عَمِلَ عَمَلَ المُحْتَرِفينَ. - He worked the way professionals work.

Notice what the إِضافَة version buys you: it is Arabic’s normal way of building a simile out of a verb. The مَصْدَر loses its tanwīn because it is مُضاف (اِنْتِشارَ, not *اِنْتِشارًا), exactly as any first term does.

4. Job three: عَدَد, how many times. Add the ة of the single instance and you can count the action: ضَرَبَ gives ضَرْبَةً “one blow”, دارَ gives دَوْرَةً “one turn”, and from there the dual and the plural do the counting:

• دارَتِ الأَرْضُ دَوْرَتَيْنِ. - The earth turned twice.
• طَرَقَ البابَ طَرْقَتَيْنِ. - He knocked on the door twice.
• قَفَزَ ثَلاثَ قَفَزاتٍ. - He jumped three times.

With a number in front, the number takes the accusative and the مَصْدَر becomes its مُضاف إِلَيْهِ (lesson 26): ثَلاثَ قَفَزاتٍ, genitive after the accusative ثَلاثَ.

5. Building the مَصْدَر: match the form. This is where learners really go wrong, and it is pure lesson 54. Take the verb, identify its measure, take that measure’s مَصْدَر:

ضَرَبَ (I) → ضَرْبًا، عَلَّمَ (II) → تَعْليمًا، تَقَدَّمَ (V) → تَقَدُّمًا، اِهْتَمَّ (VIII) → اِهْتِمامًا، اِسْتَقْبَلَ (X) → اِسْتِقْبالًا. Form I is lexical, so look it up; from Form II up it is mechanical. Watch the مُضَعَّف verb اِهْتَمَّ: its shadda unpacks in the مَصْدَر (اِهْتِمامًا), because the noun’s shape separates the two identical radicals.

6. النّائِبُ عَنِ المَفْعولِ المُطْلَقِ - the stand-ins. Arabic often skips the مَصْدَر and puts something that points at it in the same accusative slot. Four cover almost everything:

• كُلَّ / بَعْضَ + the مَصْدَر: أُحِبُّهُ كُلَّ الحُبِّ “I love him with all my heart”, فَهِمْتُ بَعْضَ الفَهْمِ “I understood in part”.
• an adverb of degree: أَحْتَرِمُهُ كَثيرًا “I respect him greatly”, تَأَخَّرَ قَليلًا “he was a little late”.
• a demonstrative: جَلَسْتُ هٰذِهِ الجِلْسَةَ “I sat in this particular way”.
• the adjective on its own, with the مَصْدَر deleted: سِرْنا سَريعًا “we walked fast”, where the full form would be سَيْرًا سَريعًا.

That last one explains a whole class of Arabic adverbs: there is no separate part of speech for “quickly”, only an accusative sitting in the absolute-object slot.

7. The frozen ones - your biggest payoff. A set of everyday words are accusatives whose verb has been deleted and is never said aloud. Most of them are absolute objects - the مَصْدَر left standing on its own:

• شُكْرًا - أَشْكُرُ شُكْرًا is understood. “Thanks.”
• عَفْوًا - “excuse me / you’re welcome”, from عَفا “to pardon”.
• حَقًّا - “really, truly”. صَبْرًا - “patience!”. مَهْلًا - “gently, hold on”.
• أَهْلًا وَسَهْلًا - “welcome”, the odd one out: here the deleted verb takes the two nouns as an object and a place, not as مَصادِر (وَجَدْتَ أَهْلًا “you have found family”), but the accusative behaves the same way.

This is why they carry that ـً: not politeness spelling, grammar. Once you see شُكْرًا as an absolute object, the fatḥatān stops being arbitrary and you will never write *شُكْرٌ.

8. المَفْعولُ لِأَجْلِهِ: the reason. Take a مَصْدَر that names an inner state - a feeling, a wish, a motive - put it in the accusative after the verb, and it tells you why:

• قُمْتُ اِحْتِرامًا لِلْأُسْتاذِ. - I stood up out of respect for the teacher.
• سافَرَ طَلَبًا لِلْعِلْمِ. - He travelled in pursuit of knowledge.
• صَمَتَ خَوْفًا مِنَ الخَطَأِ. - He kept quiet for fear of a mistake.
• تَبَرَّعَ بِالمالِ رَغْبَةً في المُساعَدَةِ. - He donated the money out of a wish to help.

It answers لِماذا؟ and it is a compact alternative to a whole لِأَنَّ clause (lesson 38): صَمَتَ خَوْفًا مِنَ الخَطَأِ = صَمَتَ لِأَنَّهُ خافَ مِنَ الخَطَأِ.

9. The three conditions it must meet. A مَصْدَر only occupies this slot if all three hold:

1. It is a قَلْبِيّ مَصْدَر - a “heart” noun: اِحْتِرام، خَوْف، رَغْبَة، طَمَع، حُبّ، كَراهِيَة، طَلَب، أَمَل، رَجاء، حِرْص، إِكْرام، تَقْدير. A مَصْدَر of a plain physical action normally does not qualify.
2. It shares the same doer as the verb: the traveller is the one who wants the knowledge.
3. It shares the same time as the verb: the wanting and the travelling are simultaneous.

Break condition 1 and the sentence collapses: *سافَرَ العَمَلَ is not Arabic, because عَمَل is not a feeling. You must say سافَرَ لِلْعَمَلِ. Break condition 2 - if the reason belongs to someone else - and you again need لِـ or a clause.

10. Indefinite, مُضاف, definite. The accusative is at home when the مَصْدَر is indefinite and alone. Make it a مُضاف and both routes are open - the accusative, or لِـ + genitive; give it الـ and Arabic prefers لِـ + genitive:

• سافَرَ طَلَبًا لِلْعِلْمِ. - indefinite: accusative.
• سافَرَ طَلَبَ العِلْمِ / سافَرَ لِطَلَبِ العِلْمِ. - مُضاف: both are correct.
• سافَرَ لِلطَّلَبِ. - definite with الـ: لِـ + genitive.

All of these are good Arabic; لِطَلَبِ العِلْمِ is the most common in modern prose. Note that the accusative usually trails its own complement - اِحْتِرامًا لِـ، خَوْفًا مِنْ، رَغْبَةً في - and that little preposition is fixed per noun, so learn the pair.

11. Writing the ـً, and hearing it. Both constructions end in fatḥatān, and lesson 55’s spelling rule applies unchanged. A word ending in a plain consonant takes the prop alif: شُكْرًا، تَعْليمًا، اِحْتِرامًا، طَلَبًا. Words that already end in something else take no alif: those ending in ة, which carry the tanwīn on the ة (رَغْبَةً، مُساعَدَةً، دَوْرَةً - never *رَغْبَةاً), those ending in a hamza after a long alif (مَساءً، اِبْتِداءً، بِناءً), and those ending in ى (رِضًا). The اِسْم مَنْقوص brings its ي back first: تَمَنٍّ → تَمَنِّيًا.

And the reward from the pausal rules: of the three tanwīns, only this one survives الوَقْف. In pause ـٌ and ـٍ go silent, but ـً is pronounced as a long ā - which is why شُكْرًا is heard as “shukrā” by everyone, and why these accusatives are the endings you can safely say out loud.

12. Telling the two apart, and what is not here. Ask the question. شَكَرْتُهُ شُكْرًا - how did I thank him? Absolute object. قُمْتُ اِحْتِرامًا - why did I stand up? Object of purpose. A second test: the absolute object proper is built on the verb’s own root - that is the whole point of it - while the object of purpose comes from a different root, since a verb is rarely its own motive.

One accusative more is left to lesson 61: the noun saying what a quantity or a comparison is measured in (اِشْتَرَيْتُ كيلو سُكَّرًا، أَكْثَرُ طُلّابًا). That is التَّمْييز, and it is neither a مَصْدَر nor an echo of the verb.

Forms & patterns

The three jobs of المَفْعول المُطْلَق:

Verb → its مَصْدَر, by measure. Take the row that matches your verb and nothing will mismatch:

The stand-ins (النّائِبُ عَنِ المَفْعولِ المُطْلَقِ):

Frozen accusatives with a deleted verb - learn them as vocabulary, not as grammar:

Common heart-مَصادِر in the لِأَجْلِهِ slot, with the preposition each one prefers:

The accusative and its لِـ paraphrase:

Examples

Common mistakes

• عَلَّمْتُهُ عِلْمًا -> عَلَّمْتُهُ تَعْليمًا - the مَصْدَر must come from the same measure as the verb. عِلْم belongs to عَلِمَ (Form I); عَلَّمَ is Form II and its مَصْدَر is تَعْليم.
• سافَرَ العَمَلَ -> سافَرَ لِلْعَمَلِ - المَفْعول لِأَجْلِهِ has to be a feeling or a motive. عَمَل is a physical activity, so it needs لِـ and the genitive.
• شَكَرْتُهُ شُكْرٌ -> شَكَرْتُهُ شُكْرًا - the absolute object is مَنْصوب without exception. A ḍamma would make it a stray subject the sentence has no room for.
• دارَتِ الدَّوْرَةَ -> دارَتْ دَوْرَتَيْنِ - to count instances, use the ة form in the dual or plural. The bare definite مَصْدَر counts nothing.
• سافَرَ طَلَبًا العِلْمِ -> سافَرَ طَلَبًا لِلْعِلْمِ - one word cannot carry a tanwīn and a مُضاف إِلَيْهِ at once. Keep the tanwīn and link with لِـ, or drop it and build the إِضافَة: سافَرَ طَلَبَ العِلْمِ and سافَرَ لِطَلَبِ العِلْمِ are both correct too.
• تَبَرَّعَ رَغْبَةاً في المُساعَدَةِ -> تَبَرَّعَ رَغْبَةً في المُساعَدَةِ - a word ending in ة never takes the prop alif, and neither does one ending in hamza after a long alif (مَساءً, not *مَساءاً); the tanwīn sits on the last letter itself.
• اِنْتَشَرَ اِنْتِشارًا النّارِ -> اِنْتَشَرَ اِنْتِشارَ النّارِ - a مُضاف loses its tanwīn. The accusative is still there; it is just a bare fatḥa now.
• أُحِبُّهُ كُلُّ الحُبِّ -> أُحِبُّهُ كُلَّ الحُبِّ - the stand-in inherits the case of the word it replaces, so كُلَّ is accusative and الحُبِّ is its مُضاف إِلَيْهِ.
• اِهْتَمَّ اِهْتِمَّامًا -> اِهْتَمَّ اِهْتِمامًا - the doubled radical of a مُضَعَّف verb unpacks in the مَصْدَر. Write no shadda and one long ا.

Tips

• Two questions sort every accusative مَصْدَر you meet: كَيْفَ / كَمْ مَرَّةً؟ gives المُطْلَق، لِماذا؟ gives لِأَجْلِهِ. Ask before you parse.
• Do not sprinkle bare تَوْكيد everywhere. In real modern prose the useful shape is مَصْدَر + adjective (تَقَدُّمًا مَلْحوظًا، اِهْتِمامًا بالِغًا), which is how Arabic says what English says with an adverb.
• Collect the إِضافَة similes as ready phrases - اِنْتِشارَ النّارِ، عَمَلَ المُحْتَرِفينَ، وُقوفَ الجُنودِ. They are the most idiomatic thing here and cannot be built by rule.
• Learn each heart-مَصْدَر together with the preposition that follows it: خَوْفًا مِنْ، رَغْبَةً في، حِرْصًا عَلى، اِحْتِرامًا لِـ. Half the errors here are the wrong preposition, not the wrong case.
• When you are unsure whether a noun is “of the heart”, write the safe لِـ paraphrase instead. سافَرَ لِلْعِلاجِ is always right; *سافَرَ العِلاجَ never is.
• Say the ـً. It is the one ending that survives the pausal form, so pronouncing شُكْرًا، حَقًّا، اِهْتِمامًا correctly costs nothing and immediately sounds native.
• Reading unvocalized prose, a bare noun straight after a complete verb phrase - no الـ, no preposition - is usually one of these two. Supply the fatḥatān and read on.