نضفت البيت كله قبل ما الضيوف يجوا.

نضفت means I cleaned or I tidied up.

It is the past-tense, first-person singular form of the verb نضّف in Egyptian Arabic. In this sentence, it refers to cleaning the house.

Because the verb itself already shows the subject.

In نضفت, the ending -ت tells you the subject is I. So Egyptian Arabic does not need a separate أنا here.

• نضفت البيت كله = I cleaned the whole house
• أنا نضفت البيت كله = also possible, but more emphatic, like I cleaned the whole house

This is a very common Egyptian Arabic pattern.

البيت كله literally means the house, all of it, which is how Arabic expresses the whole house.

A useful rule:

• noun + كل
  • matching pronoun

So:

• البيت كله = the whole house
• العربية كلها = the whole car
• الولاد كلهم = all the boys / the boys all of them

Because البيت is masculine singular, the matching form is كله.

قبل ما is a very common Egyptian way to say before when another clause follows.

So:

• قبل ما أنام = before I sleep
• قبل ما ييجي = before he comes
• قبل ما الضيوف يجوا = before the guests come / arrived

You should learn قبل ما as a fixed expression.

Because in Egyptian Arabic, after قبل ما, the following verb is normally in the imperfect/present form.

So even though نضفت is past, يجوا stays in the present-type form:

• نضفت البيت كله قبل ما الضيوف يجوا

The meaning is still past overall:

• I cleaned the whole house before the guests came
• or before the guests arrived

Arabic is expressing the second action as something that had not happened yet at that point.

يجوا means they come or they arrive.

Here it refers to the guests, so:

• الضيوف يجوا = the guests come

A useful comparison:

• ييجي = he comes
• تيجي = she comes / you come
• أجي = I come
• يجوا = they come

In informal Egyptian writing, dialect spelling is not completely fixed, so you may also see forms like ييجوا.

Because it means the guests, usually a specific set of guests known from the situation.

In this sentence, the speaker is talking about particular expected guests, not just any guests in general.

So:

• الضيوف = the guests

That sounds very natural in a sentence like this.

Yes. That is also possible.

Egyptian Arabic has flexible word order, especially in subordinate clauses like this. Both of these are natural:

• قبل ما الضيوف يجوا
• قبل ما يجوا الضيوف

The version in your sentence puts الضيوف first, which slightly highlights the subject.

A rough Egyptian pronunciation would be:

naDDaft il-bēt kullu abl ma d-dyūf yigu

A few notes:

• البيت is usually pronounced il-bēt
• كله sounds like kullu
• قبل often sounds like abl
• in الضيوف, the ل of ال is assimilated, so you hear something like d-dyūf
• يجوا is roughly yigu

Exact pronunciation can vary a bit by speaker and region.

In natural English, with نضفت in the past, the best translation is usually:

I cleaned the whole house before the guests came
or
I cleaned the whole house before the guests arrived

Even though يجوا is a present-form verb in Arabic, that is normal after قبل ما. So the English translation usually uses past tense here.