À Noël, mes nièces ouvrent leurs cadeaux pendant que les adultes préparent le café.

À Noël means at Christmas. French often uses à with holidays or specific occasions in this kind of expression.

So:

• à Noël = at Christmas
• à Pâques = at Easter

Putting À Noël at the beginning sets the time frame for the whole sentence.

Because à Noël is the normal fixed expression in French. English speakers often want to translate word-for-word, but French uses different prepositions in set phrases.

Use:

• à Noël = at Christmas
• à la maison = at home
• en hiver = in winter

So this is something you mainly learn as a standard expression.

Nièces means nieces.

Its singular form is nièce = niece.

The accent in nièce is part of the correct spelling. French accents are not optional decorations; they are part of the word. Here, the accent helps show pronunciation and distinguishes the written form.

Forms:

• une nièce = a niece
• mes nièces = my nieces

Because nièces is plural.

French possessive adjectives agree with the noun being possessed, not with the owner.

So:

• ma nièce = my niece
• mes nièces = my nieces

Since there is more than one niece, French uses mes.

Because the subject is plural: mes nièces.

The verb ouvrir must agree with its subject in person and number.

Present tense of ouvrir:

• j’ouvre
• tu ouvres
• il/elle ouvre
• nous ouvrons
• vous ouvrez
• ils/elles ouvrent

Since mes nièces = they, the correct form is ouvrent.

No. In most French verbs, the -ent ending of the ils/elles form is silent.

So ouvrent is pronounced basically like ouvre.

This is very common:

• il ouvre
• elles ouvrent

These sound very similar, and often identical in normal speech.

Because the owners are plural: mes nièces.

French chooses the possessive adjective based on the number of possessors:

• son / sa / ses = his / her / its
• leur / leurs = their

So:

• sa voiture = his/her car
• leurs cadeaux = their gifts

The plural leurs is used because the nieces have multiple gifts.

Both mean their, but French makes them agree with the thing possessed.

• leur = singular possessed noun
  
  • leur cadeau = their gift
• leurs = plural possessed noun
  
  • leurs cadeaux = their gifts

So in this sentence, cadeaux is plural, so French uses leurs.

Because cadeau is one of the French nouns that forms its plural with -x.

• un cadeau = a gift
• des cadeaux = gifts

This is a spelling pattern you just have to learn for certain nouns ending in -eau.

Other examples:

• un château / des châteaux
• un bureau / des bureaux

Because pendant que is followed by a full clause with a subject and verb.

Here:

• les adultes préparent le café
  is a full clause

So French uses:

• pendant que = while

Compare:

• pendant le repas = during the meal
  (pendant
  • noun)
• pendant que les adultes préparent le café = while the adults prepare the coffee
  (pendant que
  • clause)

Here les adultes means the adults—the specific adults in that family scene.

French often uses the definite article when talking about a clearly identifiable group in the situation.

So this sentence means the adults who are there, not just some random adults.

• les adultes = the adults
• des adultes = some adults

Because les adultes is plural.

The verb préparer must agree with the subject:

• il/elle prépare
• ils/elles préparent

Since les adultes = they, French uses préparent.

Also, just like ouvrent, the -ent ending is silent.

In this sentence, le café means the coffee in a specific situation: the coffee the adults are preparing.

French often uses the definite article for something understood in context.

• préparer le café = prepare the coffee
• boire du café = drink coffee / some coffee

So:

• du café often means an unspecified quantity of coffee
• le café often means the specific coffee being made or served

The comma separates the time expression from the main part of the sentence.

French often uses a comma after a phrase placed at the beginning for emphasis or clarity:

• À Noël, ...
• Le matin, ...
• Dans la cuisine, ...

It is similar to English writing: At Christmas, my nieces...

Yes. French word order can be changed.

For example:

• Mes nièces ouvrent leurs cadeaux à Noël pendant que les adultes préparent le café.

This is grammatically correct, but starting with À Noël puts more emphasis on the time.

So the original sentence feels a bit more natural if the speaker wants to set the scene first.

It is the present tense:

• ouvrent
• préparent

In French, the present tense can describe:

• something happening now
• a habitual action
• a vivid scene

Here it likely describes a typical Christmas scene: At Christmas, my nieces open their gifts while the adults make the coffee.

Yes, they are important.

French accents are part of correct spelling, and sometimes they affect pronunciation or help distinguish words.

In this sentence:

• À has a grave accent
• Noël has a diaeresis (ë), showing that the vowels are pronounced separately
• nièces has an accent
• préparent has an acute accent

A learner should try to write them correctly, especially in formal writing.

The ë in Noël shows that the vowels are pronounced separately.

So Noël is pronounced roughly like no-EL, not like one single vowel sound.

The two parts are separated:

• No
• ël

This kind of accent mark is called a diaeresis and often tells you that two vowels should both be sounded.

Often yes, but not always word-for-word. Its main idea is during the time that.

In this sentence, while is the best natural translation:

• pendant que les adultes préparent le café = while the adults prepare the coffee

Depending on context, it can sometimes feel closer to as or during the time when, but while is the usual choice.