المجموعة في المكتب.

A natural Egyptian pronunciation is:

el-magmūʿa fil-maktab

A few helpful notes:

• الـ is usually pronounced el- or il- in Egyptian.
• في المكتب often sounds like fil-maktab in fast speech.
• ج in Egyptian is usually a hard g sound, so مجموعة is magmūʿa, not majmūʿa.
• ع in magmūʿa is a deep throat sound that English does not have.
• مكتب is maktab.

Because in Egyptian Arabic, the letter ج is usually pronounced like g in go.

So:

• Egyptian: magmūʿa
• Modern Standard Arabic pronunciation: majmūʿa

The spelling stays the same, but the pronunciation changes by dialect.

In Arabic, present-tense sentences like this usually do not use a separate word for is/am/are.

So المجموعة في المكتب literally looks like:

the group in the office

but it naturally means:

The group is in the office.

This is very normal in both Egyptian Arabic and Standard Arabic.

If you want the past, then you do need a verb, for example:

المجموعة كانت في المكتب
The group was in the office.

في means in or sometimes at, depending on context.

So:

• في المكتب = in the office

It is a very common preposition in Arabic.

In speech, في المكتب is often pronounced smoothly as fil-maktab.

Because الـ is the Arabic definite article, meaning the.

So:

• المجموعة = the group
• المكتب = the office

Arabic uses الـ on each definite noun separately, just as English uses the with each noun when needed.

If you removed الـ from المكتب, it would become مكتب, which would usually mean an office or office/a desk, depending on context.

Yes. This is a very normal order.

The sentence structure is:

subject + prepositional phrase

So:

• المجموعة = the subject
• في المكتب = where the group is

Because Arabic drops the present-tense is, the sentence is simply:

The group + in the office

This is the standard way to say it.

It works in both.

Why?

• The wording is completely acceptable in Modern Standard Arabic.
• It is also perfectly natural in Egyptian Arabic.

The main difference is pronunciation:

• Standard Arabic pronunciation: al-majmūʿa fī al-maktab
• Egyptian pronunciation: el-magmūʿa fil-maktab

So a learner will often see the same spelling, but hear it pronounced in an Egyptian way.

The final ة is called taa marbuuTa. It often marks a noun as grammatically feminine.

So المجموعة is treated as a feminine singular noun.

That matters for agreement. For example:

• المجموعة كبيرة = The group is big
• not المجموعة كبير

At the end of a paused word, ة is usually pronounced like -a, so:

magmūʿa

But in some grammatical situations, it can sound like t.

For a negative sentence in Egyptian Arabic, use مش:

المجموعة مش في المكتب
The group is not in the office.

For a yes/no question, you can often keep the same words and just use rising intonation:

المجموعة في المكتب؟
Is the group in the office?

So the basic structure stays very simple.