יש לי יום שלם בבית, אז אני מסדרת את החדר.

Hebrew usually expresses possession with יש ל... + a person:

• יש לי = literally there is to me
• So יש לי יום שלם literally means There is a whole day for me, i.e. I have a whole day

This is the normal way to say have in Hebrew. Hebrew does not usually use a separate verb like English to have in this kind of sentence.

Examples:

• יש לי ספר = I have a book
• יש לה זמן = She has time
• אין לנו כסף = We don’t have money

לי means to me / for me.

It is made from:

• ל־ = to / for
• י = me

So:

• לי = to me
• לך = to you (masculine)
• לךְ = to you (feminine)
• לו = to him
• לה = to her
• לנו = to us

In יש לי יום שלם, the idea is there is to me a whole day.

In Hebrew, adjectives usually come after the noun.

So:

• יום שלם = a whole day
• חדר גדול = a big room
• ספר מעניין = an interesting book

Also, the adjective must agree with the noun in gender and number.

Here:

• יום is masculine singular
• so the adjective is שלם (masculine singular)

If the noun were feminine, the adjective would change:

• שנה שלמה = a whole year

Here שלם means whole / entire / complete.

So יום שלם means:

• a whole day
• an entire day

It does not mean peaceful here, even though the same root can be related to ideas like completeness or peace in other words.

בבית means in the house / at home.

It is basically:

• ב־ = in / at
• הבית = the house

When certain prepositions attach to ה־ (the), the form changes:

• ב + ה often becomes בַּ
• but with some words, especially common ones like בית, you get the standard written form בבית

In practice, בבית is the normal way to say:

• at home
• in the house

So in this sentence, יום שלם בבית means a whole day at home.

This is a very common question.

• בבית = at home / in the house
• הביתה = homeward / to the house / going home

So:

• אני בבית = I am at home
• אני הולך הביתה = I am going home

In your sentence, the person is already at home, so בבית is correct.

Yes, it can often be omitted.

Hebrew present-tense forms already show gender and number, so the pronoun is not always necessary.

• אני מסדרת את החדר
• מסדרת את החדר

Both can work, depending on context.

Why include אני?

• for clarity
• for emphasis
• because it sounds natural in many contexts
• to make the subject explicit after אז

So אז אני מסדרת את החדר feels very natural: so I’m tidying the room.

Because the speaker is female.

In Hebrew present tense, verbs agree with the subject in gender and number.

From the verb לסדר (to arrange / tidy / organize):

• מסדר = masculine singular
• מסדרת = feminine singular
• מסדרים = masculine plural / mixed plural
• מסדרות = feminine plural

So:

• a man would say: אני מסדר את החדר
• a woman says: אני מסדרת את החדר

It can mean all of those, depending on context.

The verb לסדר is very broad. It can mean:

• to arrange
• to organize
• to put in order
• to tidy up

So אני מסדרת את החדר could be understood as:

• I’m tidying the room
• I’m organizing the room
• I’m putting the room in order

If the meaning shown to the learner is I’m tidying the room, that is a very natural translation.

את is the marker of a definite direct object.

It appears before a direct object that is definite, such as:

• the...
• a name
• a pronoun
• something specific

Here:

• החדר = the room
• so Hebrew uses את

Therefore:

• אני מסדרת את החדר = I am tidying the room

Compare:

• אני מסדרת חדר = I am tidying a room / tidying rooms
• אני מסדרת את החדר = I am tidying the room

Important: את usually is not translated into English. It is a grammatical marker.

החדר means the room, while חדר means a room or just room in a general sense.

The prefix ה־ is the Hebrew definite article, meaning the.

So:

• חדר = a room
• החדר = the room

Because the sentence refers to a specific room, Hebrew uses החדר.

It is the Hebrew present tense, but Hebrew present tense often covers both:

• I tidy / I arrange
• I am tidying / I am arranging

So אני מסדרת את החדר can mean:

• I tidy the room
• I am tidying the room

In this sentence, because of the context (I have a whole day at home, so...), English would usually translate it as I’m tidying the room.

Here אז means so.

It connects the first clause with the result or consequence:

• יש לי יום שלם בבית = I have a whole day at home
• אז אני מסדרת את החדר = so I’m tidying the room

Depending on context, אז can also mean:

• then
• so

But here so is the best fit.

Yes, it is very natural.

The sentence is:

• יש לי יום שלם בבית
• אז אני מסדרת את החדר

This follows a common Hebrew pattern:

1. state the situation
2. add אז = so
3. state the result/action

Also, the order verb + object in מסדרת את החדר is normal Hebrew word order.

So the whole sentence sounds natural and idiomatic.