المج في القالب جنب الاسفنجة.

Because Arabic normally leaves out the present-tense verb to be.

So المج في القالب literally looks like the mug in the mold, but it means the mug is in the mold.

This is very normal in both Egyptian Arabic and Standard Arabic.
If you wanted past or future, then you would usually need an actual verb, such as كان for was.

في means in or inside.

So:

• في القالب = in the mold

It is a very common preposition and works much like English in.

Here جنب means next to or beside.

So:

• جنب الاسفنجة = next to the sponge

Literally, جنب is related to side, but in Egyptian Arabic it is very commonly used as a location word meaning beside.

A more formal alternative would be بجانب, but جنب is very natural in everyday Egyptian speech.

Arabic often introduces the thing being talked about first, and then gives information about where it is.

So the structure is basically:

• المج = the thing
• في القالب = first location phrase
• جنب الاسفنجة = another location phrase

This is similar to English: The mug is in the mold next to the sponge.

So the order is not strange; it is a very normal way to describe where something is.

الـ is the Arabic definite article, meaning the.

So:

• المج = the mug
• القالب = the mold
• الاسفنجة = the sponge

That means the speaker is talking about specific, known objects, not just any mug or any sponge.

Also, Arabic usually does not have a separate word for a/an.
If a noun is indefinite, it is often just left without الـ.

It is a borrowed word, originally from English mug.

In Egyptian Arabic, borrowed everyday object words are very common. Once borrowed, they behave like normal Arabic nouns, so you can add الـ to them:

• مج = mug
• المج = the mug

You may also hear other words for drinking containers, such as كوباية, depending on the object and the speaker.

In Egyptian Arabic, ج is usually pronounced like a hard g, not like English j.

So:

• المج sounds roughly like el-magg
• جنب sounds roughly like gamb

Also, ق in many Egyptian accents is often pronounced as a glottal stop ء rather than a full q sound.

So القالب may sound roughly like el-ʔāleb rather than al-qālib.

These are very typical Egyptian pronunciations.

In Egyptian Arabic, الاسفنجة is pronounced roughly el-isfinga or il-isfinga.

A useful thing to notice is the final ة:

• at the end of a phrase, it is usually pronounced -a
• so اسفنجة sounds like isfinga, not isfingat

That final -t sound only appears in certain grammatical situations, not when you pause on the word by itself.

Because the spelling usually stays conventional, but the dialect pronunciation changes.

So Egyptian speakers still write:

• الـ

but in speech they often say:

• el-
• or il-

That is why words in this sentence are commonly pronounced something like:

• el-magg
• fel-ʔāleb or fil-ʔāleb
• gamb el-isfinga

This is a normal difference between written Arabic and spoken Egyptian Arabic.