النقاش بيسنفر الحيطة.

A natural Egyptian pronunciation is roughly en-naʔʔaash biyesanfar il-ḥeeta.

Breakdown:

• النقاش → en-naʔʔaash
• بيسنفر → biyesanfar
• الحيطة → il-ḥeeta

A couple of important Egyptian features appear here:

• ق is usually pronounced as ʔ in Egyptian Arabic.
• In النقاش, the ال assimilates because ن is a sun letter, so you hear en- rather than el-.

In Egyptian Arabic, نقاش usually means a house painter / decorator—someone who paints walls, apartments, doors, and so on.

It usually does not mean a fine artist who paints pictures. For that, رسام is more common.

It is the colloquial Egyptian present form of سنفر, which means to sand, to smooth, or to rub with sandpaper.

In a painting or renovation context, it means the painter is smoothing the wall before painting or finishing it.

In Egyptian Arabic, بـ is a very common marker for the present tense.

So:

• سنفر = he sanded
• بيسنفر = he sands / he is sanding

This is one of the clearest differences between Egyptian Arabic and Standard Arabic, where the everyday present normally does not use this بـ prefix.

Because this sentence is in Egyptian Arabic, not formal Standard Arabic.

• الحيطة is the normal everyday Egyptian word for the wall
• الحائط is the Standard Arabic / formal word

So this sentence sounds natural and colloquial for Egypt.

Because Egyptian Arabic very often uses subject + verb + object in everyday speech.

So النقاش بيسنفر الحيطة is a very natural spoken pattern:

• the painter is sanding the wall

Arabic can also use verb-first order in some situations, but subject-first is extremely common in Egyptian conversation.

Because of the sun-letter / moon-letter rule.

• ن is a sun letter, so in النقاش the ل of ال is not pronounced. That is why it sounds like en-naʔʔaash.
• ح is a moon letter, so in الحيطة the ل is pronounced: il-ḥeeta.

The spelling stays ال in both words, but the pronunciation changes.

In most Egyptian Arabic, ق is pronounced as a glottal stop ʔ.

So نقاش is pronounced something like naʔʔaash, not with the full q sound you would expect in Standard Arabic.

This is one of the most recognizable features of Egyptian pronunciation.

It can mean either, depending on context:

• he sands
• he is sanding

Egyptian Arabic does not force the same simple-vs.-continuous distinction that English does. If the action is happening right now, English usually translates it as is sanding.

The form بيسنفر is 3rd person masculine singular.

That matches النقاش, which is a singular masculine noun.

If the subject were feminine, the verb would normally begin with بتـ instead. For example:

• البنت بتسنفر الحيطة = the girl is sanding the wall

Here it is pronounced like -a, so الحيطة sounds like il-ḥeeta.

That final ة is called taa marbuuTa. In pause, it is usually pronounced -a in both Standard and colloquial Arabic.

But if a suffix is added, the t sound can reappear. For example:

• حيطتي = my wall

So in this sentence you hear ḥeeta, not ḥeetat.

It is Egyptian Arabic.

Clues include:

• the بيـ present marker on the verb
• حيطة instead of the Standard word حائط
• Egyptian pronunciation such as ق becoming ʔ

So this is the kind of sentence you would expect in everyday Egyptian speech, not in formal written Standard Arabic.