أبي يركب الرف على الحائط.

أبي means my father.

The basic noun is أب = father.
When you add the suffix ـي = my, it becomes أبي = my father.

So:

• أب = father
• أبي = my father

It is usually pronounced abī.

That is a very common question.

In normal Arabic writing, short vowels are usually not written, and sometimes that creates ambiguity. The spelling يركب can represent more than one verb form.

Here, from the context, it is understood as يُرَكِّبُ = he installs / he puts up / he mounts.

But the same basic spelling can also be read as يَرْكَبُ = he rides / he boards / he mounts.

So context matters a lot. Because the sentence has the shelf and on the wall, the intended meaning is clearly installing/mounting, not riding.

It is the imperfect form, which in Arabic usually covers:

• present: he installs
• ongoing present: he is installing
• sometimes habitual: he installs / he puts up
• and with extra words, it can even refer to the future

So in this sentence, depending on context, it could mean:

• My father installs the shelf on the wall
• My father is installing the shelf on the wall

Arabic often leaves that distinction to context.

Because Arabic allows more than one normal word order.

This sentence uses subject + verb + object:

• أبي = my father
• يركب = installs
• الرف = the shelf

So the structure is:

My father installs the shelf on the wall.

Arabic can also start with the verb. A possible version would be:

يُرَكِّبُ أبي الرفَّ على الحائطِ

Both are possible. Starting with أبي can feel a little more like putting focus on my father.

الرف means the shelf, and it is the direct object of the verb.

That means it is the thing receiving the action:

• the father is doing the installing
• the shelf is the thing being installed

In fully vowelled Arabic, it would be الرَّفَّ because it is in the accusative case as the direct object. In ordinary writing, those case endings are usually not shown.

Yes. الـ is the Arabic definite article, meaning the.

So:

• رفّ = a shelf / shelf
• الرف = the shelf

The same is true for الحائط:

• حائط = a wall
• الحائط = the wall

So this sentence is talking about the shelf and the wall, not just any shelf or any wall.

على means on, onto, or upon.

So على الحائط means on the wall.

It is used because the shelf is being attached to the surface of the wall. That is why على is natural here.

Also, after a preposition like على, the following noun is in the genitive case. So in full vocalization:

الحائطِ

A learner-friendly way to understand it is:

• على = on
• الحائط = the wall
• على الحائط = on the wall

A likely fully vocalized version is:

أبي يُرَكِّبُ الرَّفَّ على الحائطِ.

This shows the intended reading more clearly:

• أبي = my father
• يُرَكِّبُ = installs / mounts
• الرَّفَّ = the shelf (direct object, accusative)
• على الحائطِ = on the wall

This is helpful because the plain spelling يركب does not show the short vowels or the shadda, so full vocalization removes the ambiguity.

This is a good pronunciation point.

In الرف, the ر is a sun letter, so the l sound of ال is assimilated.
So الرف is pronounced roughly:

ar-raff

not al-raff

In الحائط, the ح is a moon letter, so the l sound stays:

al-ḥā'iṭ

So the whole sentence, roughly pronounced, is:

abī yurakkibu ar-raffa ʿalā al-ḥā'iṭi

If you are reading without case endings in normal speech, it may sound closer to:

abī yurakkib ar-raff ʿalā al-ḥā'iṭ

يُرَكِّبُ is understandable and works well if the idea is installing or putting up a shelf.

Depending on the exact meaning, Arabic might also use other verbs:

• يُثَبِّتُ = he fixes / secures
• يُعَلِّقُ = he hangs
• يَنْصِبُ = he sets up / installs

So:

• if he is attaching a shelf firmly to the wall, يُرَكِّبُ or يُثَبِّتُ can be natural
• if something is simply hanging, يُعَلِّقُ may be better

But for a learner, أبي يُرَكِّبُ الرف على الحائط is a perfectly useful sentence to understand.