احنا مانقشناش الزهرية باداة النحت.

A few things point strongly to Egyptian Arabic:

• احنا / إحنا = we in Egyptian, instead of MSA نحن
• The negation pattern ما...ش in مانقشناش is a classic Egyptian structure
• Informal spelling like باداة instead of the more standard بأداة is also common in casual writing

A more MSA-like version would be something like:

• نحن لم ننقش الزهرية بأداة النحت

So the sentence is very much in colloquial Egyptian style.

احنا means we.

It is not strictly necessary, because the verb already shows we.
The form نقشنا already means we engraved/carved.

So both of these can work:

• مانقشناش الزهرية = We didn’t engrave the vase
• احنا مانقشناش الزهرية = We didn’t engrave the vase

Adding احنا can make the sentence clearer, more natural in conversation, or slightly more emphatic: as for us, we didn’t engrave the vase.

This is the Egyptian negation pattern ما + verb + ش.

So:

• نقشنا = we engraved / carved
• ما...ش wraps around it to make it negative
• مانقشناش = we didn’t engrave / carve

You can break it down like this:

• ما = first part of negation
• نقش = the verb root here
• نا = we
• ش = second part of negation

This ما...ش pattern is extremely common in Egyptian Arabic.

Here it is نقش, not ناقش.

That difference is very important:

• نقش = to engrave, carve, etch, decorate by carving
• ناقش = to discuss

So:

• نقشنا = we engraved / carved
• ناقشنا = we discussed

In writing, the easiest clue is the extra ا in ناقش.
Your sentence has نقشناش, so it is from نقش.

In Egyptian Arabic, the letter ق is very often pronounced as a glottal stop ء rather than the classical q sound.

So نقشناش is often pronounced something like:

• ma-naʔashnaash or ma-naʔašnāš

That means a learner may hear something closer to na’ashna than naqashna.

This is a normal Egyptian pronunciation feature.

Because ز is a sun letter.

With sun letters, the ل in ال is not pronounced separately. Instead, the following consonant is doubled in pronunciation.

So:

• الزهرية is pronounced more like ez-zohreyya
• not al-zohreyya

The same thing happens in النحت:

• النحت is pronounced more like en-naḥt

This is a pronunciation rule, not a change in meaning.

Yes — in more careful spelling, it would usually be بأداة النحت.

Breakdown:

• بـ = with / by means of / using
• أداة = tool
• النحت = sculpting / carving

So بأداة النحت means:

• with the carving tool
• using the sculpting tool

In casual Arabic writing, people often leave out the hamza and write باداة instead of بأداة.

Because أداة ends in ة (taa marbuuTa).

When a word with ة is said by itself, the ending often sounds like -a or -ah.
But when it is followed by another noun in a phrase like أداة النحت, the t sound appears.

So:

• أداة by itself may sound like adaa / adaah
• أداة النحت sounds like adaat en-naḥt

This is very common in Arabic noun combinations.

A common Egyptian-style pronunciation would be roughly:

eḥna ma-naʔašnāš ez-zohreyya b-adāt en-naḥt

A few notes:

• احنا → eḥna / iḥna
• ق in نقشناش often becomes a glottal stop ʔ
• الزهرية → ez-zohreyya
• النحت → en-naḥt

Exact vowels vary a bit from speaker to speaker.

Yes.

You can say:

• مانقشناش الزهرية بأداة النحت

and it still means we didn’t engrave the vase with the carving tool.

Adding احنا just makes the subject more explicit.

The word order in your sentence is very normal for Egyptian Arabic:

• subject pronoun + verb + object + prepositional phrase

You can change word order for emphasis, but the sentence you have is already natural.