اللمبة اللي في الحمام مطفية دلوقتي.

Because الـ is the definite article, like the in English.

• لمبة = a lamp / a light bulb
• اللمبة = the lamp / the light bulb

In this sentence, the speaker is talking about a specific light: the one in the bathroom.

اللي means that, which, or the one that, depending on the context.

In اللمبة اللي في الحمام it connects the lamp with extra information about it:

• اللمبة = the lamp
• اللي في الحمام = that is in the bathroom

So اللي works like a relative pronoun.

A very important point: in Egyptian Arabic, اللي is used for all genders and numbers. It does not change the way who / which / that do in English.

Here الحمام is definite: the bathroom.

• في حمام = in a bathroom
• في الحمام = in the bathroom

Since the whole phrase is identifying a specific lamp, it makes sense to say the bathroom. The phrase اللي في الحمام means the one in the bathroom.

مطفية is functioning like an adjective or participle here, meaning off or switched off.

So:

• اللمبة مطفية = the lamp is off

In Egyptian Arabic, this kind of word is very common for describing a current state:

• مفتوح = open
• مقفول = closed
• مكسور = broken
• مطفية = off, switched off

So even though it comes from a verb idea, in this sentence it behaves like a description of the lamp’s condition.

Because اللمبة is feminine in Arabic, so the describing word agrees with it.

• اللمبة is feminine singular
• so the predicate is مطفية

If the noun were masculine, you would usually get a masculine form instead. For example:

• النور مطفي = the light is off

This agreement is very important in Arabic.

It is not said, because in Arabic the present-tense to be is usually omitted.

So:

• اللمبة مطفية literally looks like the lamp off
• but it means the lamp is off

This is normal in both Egyptian Arabic and Standard Arabic for present-time statements.

If you want past or future, then Arabic uses other forms:

• كانت مطفية = it was off
• هتبقى مطفية = it will be off

دلوقتي means now or right now.

Putting it at the end is very natural in Egyptian Arabic:

• اللمبة اللي في الحمام مطفية دلوقتي = the bathroom light is off now

You can sometimes move time words around, but sentence-final دلوقتي is extremely common and natural.

Yes. This is a very normal word order for a nominal sentence.

The structure is:

• اللمبة = topic / subject
• اللي في الحمام = relative clause describing which lamp
• مطفية = description/state
• دلوقتي = time expression

So the sentence is built like:

the lamp that is in the bathroom + off + now

That is a very common Arabic pattern.

A common Egyptian pronunciation would be:

el-lamba elli fil-ḥammām maṭfayya دلوقتي

A more learner-friendly approximation:

el-lamba elli fil-hammam matfayya delwa’ti

A few notes:

• اللمبة is usually pronounced el-lamba
• اللي is often elli
• في الحمام often sounds like fil-hammam in connected speech
• دلوقتي is often pronounced delwa’ti or dilwa’ti

Pronunciation varies a bit by speaker and region, but this is a good practical version.

That is just connected speech.

• في = in
• الحمام = the bathroom

When spoken together, في الحمام is commonly pronounced like fil-hammam.

This happens because the words flow together naturally. It is very common in Egyptian Arabic for short words like في to connect tightly to the next word.

In Egyptian Arabic, لمبة / اللمبة often refers to a light bulb, and in everyday speech it can also refer to the light itself depending on context.

So in this sentence, it likely means the light bulb / light in the bathroom. In natural English, many people would simply translate the whole thing as The bathroom light is off now.

Yes, there are several natural alternatives. For example:

• نور الحمام مطفي دلوقتي = The bathroom light is off now
• اللمبة بتاعة الحمام مطفية دلوقتي = The bathroom lamp/light bulb is off now

These are slightly different in style:

• اللي في الحمام = the one that is in the bathroom
• بتاعة الحمام = belonging to / associated with the bathroom
• نور الحمام = the bathroom light

All are understandable, but the original sentence is completely natural.

It can cover all of those in Egyptian Arabic.

Depending on context, اللي may mean:

• who
• that
• which

Examples:

• الراجل اللي هناك = the man who is over there
• الكتاب اللي على الترابيزة = the book that is on the table
• العربية اللي شفتها = the car which I saw

So in this sentence, اللي is simply the everyday Egyptian relative word connecting اللمبة with في الحمام.