اختي في البيت دلوقتي.

A common Egyptian Arabic pronunciation is:

okhti fil-bēt dilwa'ti

A rough breakdown:

• اختي → okhti = my sister
• في البيت → fil-bēt = at home / in the house
• دلوقتي → dilwa'ti = now

Notes:

• في البيت often sounds like fil-bēt because fi + el- gets said together.
• دلوقتي may also be heard as delwa'ti depending on the speaker.

Word by word:

• اختي = my sister
• في = in / at
• البيت = the house / the home
• دلوقتي = now / right now

So the full sentence means My sister is at home now.

In Egyptian Arabic, as in Arabic generally, the present-tense verb to be is usually not said.

So:

• اختي في البيت دلوقتي literally looks like
• my sister at home now

But it naturally means:

• My sister is at home now

This is completely normal. You usually only express to be in other tenses, not in simple present statements like this.

Because the -ي ending means my.

Here is the pattern:

• أخت / اخت = sister
• أختي / اختي = my sister

That -ي is a possessive suffix. Arabic often attaches possession directly to the noun instead of using a separate word like my.

Other examples:

• بيتي = my house
• صاحبي = my friend

Both spellings may be seen, especially in informal writing.

• أختي is the more careful spelling
• اختي is very common in casual writing, texting, and dialect writing

The difference is the hamza:

• Formal spelling usually keeps it: أختي
• Informal Egyptian writing often drops it: اختي

So the sentence is normal as written, especially in colloquial Egyptian Arabic.

Literally, في البيت does mean in the house. But in everyday use, it often means at home.

So:

• أنا في البيت = I’m at home
• اختي في البيت = My sister is at home

This is very natural Arabic, just like English sometimes uses home in a broader sense than the literal building.

دلوقتي means now, right now, or at the moment in Egyptian Arabic.

It is a very common everyday word. You will hear it constantly in conversation.

Examples:

• أنا مشغول دلوقتي = I’m busy right now
• تعال دلوقتي = Come now

In more formal Arabic, you would more likely see الآن, but in Egyptian speech دلوقتي is the normal conversational choice.

It can move.

The sentence:

• اختي في البيت دلوقتي

is very natural, but Egyptian Arabic allows flexibility. You may also hear:

• اختي دلوقتي في البيت
• دلوقتي اختي في البيت

The meaning stays very similar, though the emphasis changes a little:

• putting دلوقتي earlier can emphasize now
• keeping it at the end sounds very natural and neutral

A natural Modern Standard Arabic version would be:

أختي في البيت الآن.

That is very close in structure:

• أختي = my sister
• في البيت = at home / in the house
• الآن = now

Compared with Egyptian Arabic:

• Egyptian: اختي في البيت دلوقتي
• MSA: أختي في البيت الآن

In Egyptian Arabic, a very common way is to use مش.

So:

• اختي في البيت دلوقتي = My sister is at home now
• اختي مش في البيت دلوقتي = My sister is not at home now

مش is the normal everyday negation for this kind of sentence.

Yes. In speech, this is not really a separate issue, because the difference is mainly about spelling, not meaning.

When speaking, learners often say something like:

• okhti

In writing:

• أختي is more careful
• اختي is more informal

So you do not need to think of them as two different words.

Because in fast, natural speech, في + البيت are usually linked together.

So:

• في البيت becomes
• fil-bēt

This happens because:

• في ends in a vowel sound
• البيت begins with el-
• together they flow into fil-

This kind of connected pronunciation is very common in spoken Egyptian Arabic.