Madame, avez-vous quelque chose à signer avant midi ?

Because this sentence is asking a question in a formal way.

In French, one common formal question pattern is inversion:

• statement: Vous avez quelque chose... = You have something...
• question: Avez-vous quelque chose... ? = Do you have something...?

So avez-vous literally flips the verb and subject pronoun:

• avez = have
• vous = you

This is more formal than everyday spoken French, where people often say:

• Vous avez quelque chose à signer avant midi ? or
• Est-ce que vous avez quelque chose à signer avant midi ?

In inversion questions, French joins the verb and the subject pronoun with a hyphen.

So:

• avez-vous
• parlez-vous
• voulez-vous

The hyphen is required in standard written French for this structure.

Madame is a form of address, like Madam or Ma’am.

It shows the speaker is talking directly to a woman in a polite or formal way. The comma is there because it is a direct address:

• Madame, avez-vous... ?

You could also have:

• Monsieur, avez-vous... ?
• Docteur, avez-vous... ?

Yes, it is clearly formal and polite.

That comes from several things:

• Madame
• vous instead of tu
• the inversion avez-vous

In casual speech, a French speaker would often use something less formal, such as:

• Vous avez quelque chose à signer avant midi ?

Quelque chose means something.

It is a fixed expression:

• quelque = some
• chose = thing

But in practice, you should learn quelque chose as one unit meaning something.

Examples:

• J’ai quelque chose à dire. = I have something to say.
• Vous voulez quelque chose ? = Do you want something?

After quelque chose, French normally uses à + infinitive when it means something to ...

So:

• quelque chose à manger = something to eat
• quelque chose à boire = something to drink
• quelque chose à signer = something to sign

Using de signer here would not be correct for this meaning.

A helpful pattern to remember is:

• avoir quelque chose à + infinitive

For example:

• J’ai quelque chose à faire. = I have something to do.

À signer means to sign or more literally that needs to be signed.

So quelque chose à signer means:

• something to sign
• something that has to be signed

This is a very common French structure:

• un livre à lire = a book to read
• des lettres à envoyer = letters to send
• un document à signer = a document to sign

Here, vous is most likely singular formal because the sentence begins with Madame.

French vous can mean:

1. you when speaking politely to one person
2. you all when speaking to more than one person

In this sentence, because of Madame, it clearly refers to one woman in a polite way.

Avant midi means before noon.

French often uses time expressions like this without an article:

• avant midi = before noon
• après midi is different, because après-midi is a noun meaning afternoon

Here, midi means noon or 12:00 p.m.

So:

• avant midi = before 12 o’clock

Normally, no. Standard French says avant midi.

French often leaves out the article in fixed time expressions like this. So learners should simply remember:

• avant midi
• après midi is not the same structure here; l’après-midi means the afternoon

So in this sentence, avant midi is the natural expression.

A more everyday version would often be:

• Madame, vous avez quelque chose à signer avant midi ? or
• Madame, est-ce que vous avez quelque chose à signer avant midi ?

All three versions are correct, but they differ in style:

• Avez-vous... ? = more formal
• Est-ce que vous avez... ? = neutral, very common
• Vous avez... ? = common in speech

Avant midi does not have to stay at the end, but the given order is very natural.

For example, you could say:

• Avez-vous quelque chose à signer avant midi ?
• Avant midi, avez-vous quelque chose à signer ?

The second version puts more emphasis on the time. The original sentence sounds the most neutral and natural in many situations.

Yes, there is a liaison.

In careful pronunciation, avez-vous is pronounced with a z sound linking the two words:

• avez-vous ≈ ah-vay-zoo

That linking sound happens because avez ends in a normally silent z, and vous begins with a vowel sound.

This liaison is expected in formal speech and in this inversion structure.

You would usually switch from vous to tu.

Formal:

• Madame, avez-vous quelque chose à signer avant midi ?

Informal:

• As-tu quelque chose à signer avant midi ?

In everyday speech, many people would more naturally say:

• Tu as quelque chose à signer avant midi ?

So the changes are:

• vous → tu
• avez-vous → as-tu
• usually no Madame

By default, avez-vous quelque chose à signer ? suggests that the person being addressed has something that she needs to sign.

So the most natural reading is:

• Do you have something to sign?

If you wanted to make it clear that someone else must sign it, French would usually express that more specifically, for example with a different structure.

So learners should understand quelque chose à signer here as something for you to sign.