אני מסדרת את החדר לפני הפגישה.

Not by itself. In the present tense, Hebrew verb forms usually show gender and number, but not person.

So מסדרת can mean:

• I arrange / I am arranging if the speaker is feminine
• you arrange / you are arranging when speaking to one female
• she arranges / she is arranging

That is why אני is important here: it tells you the subject is I.

Because the sentence is spoken by a female speaker.

• אני מסדרת את החדר לפני הפגישה. = said by a woman
• אני מסדר את החדר לפני הפגישה. = said by a man

In the Hebrew present tense, the verb agrees with the speaker’s gender.

מסדרת is the feminine singular present-tense form of the verb לסדר.

A few useful details:

• Dictionary form: לסדר = to arrange / organize / tidy up
• Root: ס-ד-ר
• Pattern: this verb is in pi'el

So מסדרת means something like:

• arranging
• organizing
• tidying up

Which English translation sounds best depends on context.

Because in modern Hebrew present tense, there is usually no verb equivalent to English present-tense to be.

English says:

• I am arranging the room

Hebrew simply says:

• אני מסדרת את החדר

So Hebrew does not need a separate word for am here.

It can mean either one.

Hebrew present tense often covers both:

• simple present: I tidy / I arrange
• present progressive: I am tidying / I am arranging

The context tells you which one is meant. In this sentence, many learners will naturally understand it as I am tidying the room before the meeting, but I tidy the room before the meeting can also be possible depending on context.

Here את is the direct object marker. It comes before a definite direct object.

In this sentence:

• את החדר = marks the room as the direct object

Important points:

• את usually appears before nouns with the
• It does not really translate into English
• You use it with definite nouns, proper names, and pronouns

Examples:

• אני רואה את הילד = I see the boy
• אני רואה ילד = I see a boy
  No את, because ילד is indefinite

It is the same spelling, but it is not the same word.

Without vowel marks, both are written את, but they are different:

• אַתְּ = you (to one female), usually pronounced at
• אֶת = the direct object marker, usually pronounced et

So in this sentence, את is definitely the object marker, not you.

Because ה־ is the Hebrew definite article, meaning the.

So:

• חדר = room
• החדר = the room

and

• פגישה = meeting
• הפגישה = the meeting

So the sentence is talking about a specific room and a specific meeting.

Here לפני means before in a time sense:

• לפני הפגישה = before the meeting

But לפני can also mean in front of, depending on context.

Examples:

• לפני הפגישה = before the meeting
• לפני הבית = in front of the house

So the same word can express either time or location.

לפני is a very common and natural Hebrew preposition for before.

Structure:

• לפני
  • noun

Examples:

• לפני השיעור = before the lesson
• לפני הארוחה = before the meal
• לפני הפגישה = before the meeting

It is one of the standard ways to say before in Hebrew.

This order is very natural, but Hebrew word order is somewhat flexible.

The given sentence:

• אני מסדרת את החדר לפני הפגישה

is a normal, neutral order:

• subject + verb + object + time phrase

You may also hear:

• לפני הפגישה אני מסדרת את החדר

That puts more emphasis on before the meeting.

So the original sentence is not the only possible order, but it is a very standard one.

A common pronunciation is:

ani mesadéret et hachéder lifnéi hapgishá

A few pronunciation notes:

• אני = ani
• מסדרת = mesadéret
• את = et
• החדר = hachéder
• לפני = lifnéi
• הפגישה = hapgishá

The stress is usually near the end in:

• mesadéret
• lifnéi
• hapgishá

It can mean several related things, all connected to putting in order.

Depending on context, לסדר can mean:

• to tidy
• to arrange
• to organize
• to sort out
• sometimes even to fix or set up

So in this sentence, מסדרת את החדר could be understood as:

• tidying the room
• arranging the room
• organizing the room

The exact English choice depends on the situation.