Marie a l’air d’être rassurée maintenant que la guichetière a accepté le justificatif.

Avoir l’air means to seem, to look, or to appear.

So:

• Marie est rassurée = Marie is reassured
• Marie a l’air d’être rassurée = Marie seems to be reassured

The sentence does not state this as a fact with certainty; it describes how Marie appears now.

This expression is very common in French:

• Il a l’air fatigué. = He looks tired.
• Tu as l’air content. = You seem happy.

Here, a l’air d’être rassurée is a slightly fuller way of saying seems to be reassured.

Both are possible.

• Marie a l’air rassurée = Marie looks reassured
• Marie a l’air d’être rassurée = Marie seems to be reassured

The version with d’être is a little more explicit and slightly more formal or careful in tone. It emphasizes the idea of seeming to be in that state.

French often allows both patterns after avoir l’air:

• Il a l’air malade
• Il a l’air d’être malade

In everyday speech, the shorter version is often more common, but the longer one is perfectly natural.

Because the expression is avoir l’air de + infinitive.

So the structure is:

• avoir l’air de faire quelque chose = to seem to do something
• avoir l’air d’être... = to seem to be...

Since être begins with a vowel, de becomes d’:

• de être → d’être

Examples:

• Elle a l’air de comprendre. = She seems to understand.
• Il a l’air d’aimer ça. = He seems to like that.

Because it refers to Marie, who is feminine.

Rassuré / rassurée is an adjective or past participle used here to describe Marie’s state:

• masculine singular: rassuré
• feminine singular: rassurée
• masculine plural: rassurés
• feminine plural: rassurées

Since Marie is female, French uses rassurée.

Compare:

• Paul a l’air rassuré.
• Marie a l’air rassurée.

Rassurée means reassured, relieved, or no longer worried.

It comes from the verb rassurer, meaning to reassure.

So:

• rassurer quelqu’un = to reassure someone
• être rassuré(e) = to feel reassured / relieved

In this sentence, Marie was probably worried about whether the document would be accepted, and now she seems relieved because it was.

Yes, maintenant que means now that.

It introduces the reason or new situation that changes things:

• Marie a l’air d’être rassurée maintenant que... = Marie seems reassured now that...

It often works like English now that, introducing something that has happened and explains the present situation.

Examples:

• Maintenant que tu es là, on peut commencer. = Now that you’re here, we can start.
• Il est content maintenant qu’il a réussi. = He’s happy now that he succeeded.

A accepté is the passé composé, a very common French past tense.

It is formed with:

• auxiliary verb avoir
• past participle accepté

So:

• a accepté = accepted / has accepted

In this sentence:

• la guichetière a accepté le justificatif = the clerk accepted the supporting document

French uses the passé composé here because the acceptance is a completed action in the past, and it explains Marie’s current relief.

La guichetière means a female clerk at a counter/window, for example in:

• a station
• a post office
• an office reception desk
• an administrative service counter

It comes from guichet, meaning a service window or counter window.

The masculine form is guichetier. So:

• un guichetier = a male counter clerk
• une guichetière = a female counter clerk

This word is more specific than just employee or worker.

Un justificatif is a supporting document or proof used to justify or confirm something.

Depending on context, it might be:

• proof of address
• proof of identity
• proof of payment
• some official supporting paperwork

In administrative French, justificatif is extremely common.

Examples:

• un justificatif de domicile = proof of address
• un justificatif d’identité = proof of identity

So here, le justificatif means the document Marie needed to provide, and the clerk accepted it.

Le justificatif refers to a specific document that is already known in the situation.

So it is:

• le justificatif = the supporting document

This suggests that both speaker and listener know which document is being discussed.

If you said un justificatif, it would sound more like a supporting document, not a specific one already identified.

Yes. That whole clause explains why Marie now seems relieved.

Structure:

• main clause: Marie a l’air d’être rassurée
• subordinate clause: maintenant que la guichetière a accepté le justificatif

So the idea is: Marie seems relieved because now the clerk has accepted the document.

It is not just extra information; it gives the context that explains Marie’s apparent emotional state.

Yes, absolutely.

• Marie semble rassurée maintenant que la guichetière a accepté le justificatif.

This means almost the same thing:

• sembler = to seem
• avoir l’air = to seem / to look

Difference in feel:

• sembler is often a bit more neutral or formal
• avoir l’air can feel a bit more visual or observational, like she looks relieved

Both are very natural French.

No, the t at the end of air is not pronounced.

a l’air is pronounced roughly like:

• ah lair

A few pronunciation notes:

• a = the verb avoir in the third person singular
• l’air sounds like lair
• there is a smooth connection between a and l’air, but not a strong English-style stress

So:

• Marie a l’air... sounds roughly like ma-REE ah lair...

Nothing in the sentence is negative, so no negative structure is needed.

There is no not, no longer, or didn’t here. The sentence is affirmative throughout:

• Marie seems reassured
• the clerk accepted the document

If it were negative, you might have:

• Marie n’a pas l’air rassurée... = Marie doesn’t seem reassured...
• la guichetière n’a pas accepté le justificatif = the clerk did not accept the document

So the absence of ne is simply because there is no negation.

It is mostly neutral, with a slightly formal/administrative feel because of words like guichetière and justificatif.

The grammar itself is normal standard French:

• avoir l’air de
• maintenant que
• passé composé

What makes it sound a bit administrative is the situation and vocabulary, not the grammar. In everyday conversation, people might use simpler words depending on context, but this sentence is perfectly natural standard French.